Beware Boiúna (2026) Review: A Dark Giant-Snake Horror Movie That Brings Amazonian Folklore to the Big Screen
Bloggerworld 
Beware Boiúna (2026) is a horror adventure movie built around one very simple but frightening idea: what if a huge mythical snake ruled a dangerous part of the Amazon rainforest, and a group of people accidentally entered its territory?
Directed by Mike P. Nelson, the movie stars Kiana Madeira, Jessica Rothe, and Logan Marshall-Green. It combines creature horror, survival, jungle adventure and elements of Amazonian folklore. The film was released in theaters in the United States on October 2, 2026, with a runtime of 104 minutes and an R rating. (Rotten Tomatoes)
At first glance, Beware Boiúna may look like another giant-snake movie. That comparison is understandable. Hollywood has made plenty of movies about enormous snakes, from Anaconda to various creature-feature films. But Beware Boiúna tries to take a somewhat different path by connecting its monster to a legendary creature and by placing the story inside a serious survival adventure.
The result is a movie that has some genuinely effective horror scenes, an impressive setting and a strong central performance from Kiana Madeira. At the same time, it has weaknesses. Some action scenes are difficult to follow, the giant snake is hidden for long periods, and some of the characters and story ideas do not receive enough development.
So, is Beware Boiúna worth watching?
Yes, especially if you enjoy creature horror, giant monsters, jungle survival stories and movies about people being hunted in isolated environments. However, viewers looking for another fun, light-hearted Anaconda-style adventure may find this movie much darker and more serious.
Beware Boiúna (2026) Quick Review
Movie: Beware Boiúna
Year: 2026
Director: Mike P. Nelson
Writers: Alan B. McElroy, Tony Giglio and Mike P. Nelson
Main Cast: Kiana Madeira, Jessica Rothe, Logan Marshall-Green
Genre: Horror, Action, Thriller, Adventure
Runtime: 104 minutes
Rating: R
Distributor: Lionsgate
Release: October 2, 2026
Setting: Amazon rainforest
Main threat: Boiúna, a gigantic mythical snake
The movie currently has a mixed critical response. Rotten Tomatoes lists it at around the mid-60-percent range from critics, showing that reviewers are divided rather than overwhelmingly positive or negative. (Rotten Tomatoes)
That mixed response makes sense because Beware Boiúna is a movie with some very good ideas and several impressive moments, but it does not always bring those ideas together smoothly.
What Is Beware Boiúna About?
The story takes viewers deep into the Amazon rainforest.
A medical team travels into the region on a humanitarian mission. Their goal is not to hunt monsters or search for treasure. They are there to help people.
That is important because the movie initially gives its characters a reason to be in such a dangerous environment.
Among the central characters is Alli, played by Jessica Rothe, and Lena, played by Kiana Madeira. Lena has a much stronger connection to the area and understands the environment better than many of the outsiders who arrive there.
The situation becomes increasingly dangerous when the group encounters other people whose reasons for being in the region are very different.
One of those characters is Brennan Malloy, played by Logan Marshall-Green.
The movie gradually reveals that the biggest problem is not simply the people involved.
Something much larger is waiting.
That creature is Boiúna.
Boiúna is presented as a gigantic ancient predator connected to Amazonian folklore. Rather than behaving like an ordinary snake, the creature feels almost like a force of nature.
Once the characters enter its territory, the story becomes a fight for survival.
The basic question becomes very simple:
Who will survive, and who will become food?
The Biggest Strength of Beware Boiúna
The strongest part of Beware Boiúna is its atmosphere.
The Amazon rainforest is not presented as a beautiful tourist destination.
It is hot.
It is wet.
It is uncomfortable.
It is difficult to navigate.
And it feels dangerous.
The characters sweat, get dirty and become physically exhausted. The environment looks rough rather than polished.
This is one reason some critics responded positively to the movie. The HoloFiles, for example, praised the way the production makes the characters look genuinely exhausted and dirty, arguing that filming in a natural environment helps the movie feel more immersive. (The HoloFiles)
That approach works.
When a horror movie is set in a jungle, the environment itself can become part of the monster.
You do not always know what is hiding behind the trees.
You cannot easily see across the water.
You cannot always tell where a sound is coming from.
And if something enormous is moving underneath the surface, you may not see it until it is already too late.
Beware Boiúna understands this idea.
The Amazon Setting Makes the Movie More Interesting
One of the easiest ways for a giant-monster movie to become boring is to put the characters in a normal environment.
Imagine a giant snake attacking people in a shopping mall.
It could still work, but the location would not necessarily add much.
The Amazon is different.
It provides darkness, water, trees, mud, insects, heat and isolation.
The characters cannot simply call for help.
They cannot jump into a car and drive away.
There are no easy escape routes.
Even moving through the environment becomes a challenge.
That makes the snake more frightening.
A monster does not have to appear every five minutes if the audience already knows it could be anywhere.
This is one of the better ideas in Beware Boiúna.
The film understands that fear can come from waiting.
Kiana Madeira Is One of the Best Parts of the Movie
Kiana Madeira gives the movie one of its strongest performances.
She plays Lena, a woman who is more connected to the environment than many of the outsiders around her.
Lena does not feel like a traditional horror character whose only purpose is to scream and run away.
She becomes increasingly important as the story develops.
Her survival skills and understanding of the environment make her valuable.
But the movie also gives her an emotional reason to keep moving forward.
That helps the audience connect with her.
Madeira also handles the physical side of the role well.
This is a movie where the characters are constantly getting dirty, wet, tired and frightened.
The performance has to sell the idea that these people have been pushed beyond their normal limits.
Madeira does that effectively.
The HoloFiles also singled out Lena as the most interesting character, noting that Madeira’s performance grows stronger as the survival situation becomes more intense. (The HoloFiles)
Jessica Rothe Brings Energy to the Story
Jessica Rothe plays Alli, one of the members of the medical mission.
Her character gives the story another perspective.
Alli is an outsider entering a dangerous environment because she wants to help people.
That creates an interesting contrast.
She has good intentions, but good intentions do not make someone immune to danger.
Once the monster appears, her professional experience becomes less important than basic survival.
Rothe’s performance helps maintain the emotional side of the story.
She also has to deal with some extremely unpleasant situations.
One particularly memorable sequence involves a character becoming trapped in thick mud.
The scene is effective because it removes the normal advantages characters have in action movies.
There is no easy running.
There is no quick escape.
Every movement makes the situation worse.
And somewhere nearby, there is a giant predator.
That is exactly the kind of situation where a creature movie can become genuinely frightening.
Logan Marshall-Green Plays a Very Different Character
Logan Marshall-Green plays Brennan Malloy.
Unlike the medical team, Brennan’s presence is connected to a more aggressive and exploitative side of the story.
This creates a conflict between people who have come into the region for different reasons.
The movie uses Brennan and his group to explore some of its ideas about exploitation, colonialism and the damage humans can cause when they treat nature as something to be conquered.
The idea is interesting.
However, this is also one of the areas where the movie sometimes feels too obvious.
The themes are not particularly subtle.
The audience can understand what the filmmakers are saying without much effort.
Still, the conflict gives the movie something more than simply:
People enter jungle. Snake attacks people. People run away.
There is an attempt to give the monster story a bigger meaning.
Boiúna: The Real Star of the Movie
The title character is obviously the giant snake.
And Boiúna is a strong concept.
The creature comes from Amazonian folklore, where the name is associated with a gigantic serpent or water snake.
The filmmakers take that mythology and transform it into a modern horror monster.
The result is something closer to a legendary predator than an ordinary animal.
Boiúna is enormous.
It is fast.
It can move through water.
It can hide in darkness.
And it appears to understand its territory.
The creature is not just an animal randomly attacking people.
The movie presents it almost as the guardian of a place that humans have entered.
That idea gives the monster more personality without turning it into a talking creature.
Is Boiúna Scary?
Yes, but the answer depends on what you expect from a giant-snake movie.
If you want to see the entire creature clearly throughout the movie, you may become frustrated.
The filmmakers deliberately keep Boiúna hidden for long periods.
This follows the old horror technique of allowing the audience to imagine the monster before showing everything.
It is the same basic idea that has been used by creature movies for decades.
But it is a risky strategy.
Some critics liked the suspense.
Others hated it.
RogerEbert.com’s Brian Tallerico criticized the movie because the snake is often difficult to see, arguing that the camera movement and dark lighting make the attacks difficult to understand. (Roger Ebert)
The A.V. Club made a similar criticism, saying the movie’s darkness makes it difficult to appreciate the giant snake. (AV Club)
So this is one of the movie’s biggest weaknesses and one of its biggest strengths at the same time.
Why Does Beware Boiúna Hide the Snake?
There are two possible ways to look at this.
The first is that the filmmakers want to build suspense.
If the audience sees Boiúna clearly from the beginning, the creature may become less frightening.
The second possibility is practical.
Large creature effects are difficult and expensive to make convincing.
Keeping the monster partially hidden can reduce the pressure on visual effects.
The movie appears to use both approaches.
Interestingly, IMDb notes that the production used practical techniques to help create the snake’s movement, including dragging a large piece of HVAC equipment through the jungle to simulate the weight and movement of the creature. (IMDb)
That is a fun production detail because it shows that the filmmakers were thinking about physical movement rather than simply creating everything digitally.
The Horror Is Better When the Movie Slows Down
One of the most interesting things about Beware Boiúna is that its best scenes are not necessarily the biggest action sequences.
The movie works particularly well when it slows down.
A character is trapped.
The jungle becomes quiet.
Something is moving nearby.
Nobody knows exactly where the snake is.
That is when the tension becomes strongest.
The mud sequence is a good example.
Lena becomes trapped in thick mud, and the situation becomes increasingly dangerous.
She cannot simply stand up and run.
The mud itself is fighting against her.
Then the possibility of Boiúna nearby makes everything worse.
RogerEbert.com’s review also identified this sequence as one of the film’s strongest moments, describing it as an unusually effective section where the geography and danger become clear. (Roger Ebert)
That tells you something important about the movie.
It is not necessarily at its best when it is loud.
It is at its best when it allows fear to build.
The Action Scenes Can Be Difficult to Follow
This is probably my biggest criticism of Beware Boiúna.
Some action scenes are filmed with very aggressive camera movement.
The camera shakes.
The editing becomes fast.
Characters run.
The snake moves.
People scream.
And suddenly the scene is over.
The problem is that the audience sometimes needs to understand where everyone is.
If the snake is attacking from the left, where are the characters?
If someone is running toward the river, how far away is the river?
Where is the monster?
Where is the boat?
Where can the characters escape?
When a movie does not answer those questions clearly, tension can disappear.
Instead of being frightened, the audience may simply become confused.
RogerEbert.com’s review made exactly this criticism, arguing that the filmmaking sometimes makes the snake attacks difficult to understand because the geography is unclear. (Roger Ebert)
That is a fair criticism.
Beware Boiúna Compared With Anaconda
It is impossible to discuss Beware Boiúna without mentioning Anaconda.
The two movies share an obvious connection:
A giant snake is hunting people in a tropical environment.
But the tone is different.
Anaconda has become famous partly because it mixes horror, adventure and campy entertainment.
Beware Boiúna takes itself more seriously.
It wants to create dread.
It wants the jungle to feel threatening.
It also wants to discuss human exploitation of nature.
That does not mean Beware Boiúna is better or worse.
They are simply aiming at different experiences.
If you want a playful creature adventure, Anaconda may remain more entertaining.
If you want something darker and more serious, Beware Boiúna may be closer to what you want.
The Movie Has a Strong Environmental Message
One of the film’s more interesting themes is the relationship between humans and nature.
The story involves a region affected by human exploitation.
Illegal gold mining is part of the movie’s broader environmental context.
The filmmakers use the giant snake as a symbol of nature pushing back.
This is not a new idea.
Monster movies have often used creatures to represent environmental destruction.
But it works well here because the Amazon rainforest is not simply a backdrop.
The forest is central to the story.
The characters need the environment to survive, but the environment can also kill them.
The movie suggests that people cannot enter natural spaces, destroy them and then expect nothing to happen.
The HoloFiles highlighted this idea, noting that the movie uses illegal gold mining and the snake’s territory to explore human exploitation of nature. (The HoloFiles)
Nature Is Almost a Character
The best environmental element in the movie is the way nature is treated.
The rainforest feels alive.
Water is everywhere.
Mud creates problems.
The heat wears down the characters.
The trees block visibility.
The darkness hides danger.
This makes the location feel like a character with its own rules.
The humans are not in control.
That is important.
Many action movies teach audiences that human technology can solve every problem.
Get a bigger weapon.
Get a faster vehicle.
Build a stronger machine.
Beware Boiúna takes a different approach.
Technology does not automatically save anyone.
In the jungle, nature has the advantage.
The Movie’s Use of Folklore
Another strong feature is the use of Boiúna mythology.
Hollywood creature movies often invent monsters specifically for the film.
That can work, but there is something more interesting about using a creature connected to existing folklore.
It gives the monster a sense of history.
Boiúna is not simply a random Hollywood snake.
The name and mythology connect the creature to the Amazon.
That makes the film feel more rooted in its setting.
At the same time, the filmmakers are clearly adapting the legend for a modern horror audience.
The result is not a documentary about folklore.
It is a fictional creature feature.
That distinction matters.
The Movie Looks Dirty in a Good Way
This may sound strange, but the dirty appearance of the movie is one of its advantages.
The characters do not look like actors who just stepped out of a makeup trailer.
They look exhausted.
They sweat.
They get covered in mud.
Their clothes become damaged.
Their faces show the physical stress of the journey.
That makes the survival story more believable.
A giant snake movie can easily become silly if the characters look too clean.
Beware Boiúna avoids much of that problem.
The physical environment makes the movie feel more uncomfortable.
And discomfort is useful in horror.
The Practical Effects Are Worth Mentioning
There is something satisfying about knowing that the production used practical methods to help sell the creature.
According to IMDb’s production details, the filmmakers used large physical objects to simulate the snake’s movement and used large representations of the creature’s head to help actors with eyelines. (IMDb)
That type of filmmaking can make a difference.
Actors perform differently when they have something physical to react to.
Instead of staring at a blank green screen and pretending that a monster is there, they can interact with a physical reference.
That does not automatically make a movie great, but it can improve performances and creature interaction.
The Sound Design Helps Build Fear
A giant snake does not need to be visible to be frightening.
Sometimes the sound is enough.
A strange movement in the water.
Something scraping against a boat.
A sudden noise in the jungle.
Then silence.
This is where the film’s sound design becomes important.
The audience can hear danger before seeing it.
That creates anticipation.
The problem comes when the movie combines loud music with shaky camera work.
At those moments, the sound can become overwhelming instead of frightening.
The strongest horror scenes usually know when to become quiet.
Beware Boiúna occasionally gets this balance right.
The Film’s Pacing Is Uneven
At 104 minutes, Beware Boiúna is not excessively long.
That is good.
A movie about a giant snake does not need three hours.
However, some parts of the story feel slower than others.
The early sections spend time introducing the characters and the different groups.
That is necessary because the audience needs to understand who everyone is.
But the movie could have developed some of those characters more deeply.
Once the creature becomes the main focus, some of the earlier character ideas become less important.
This creates the feeling that the film is moving between two different movies:
- A serious jungle drama about humanitarian work and exploitation.
- A creature horror movie about a giant snake.
Both ideas are interesting.
The problem is that they do not always fit together perfectly.
The Characters Could Be Better Developed
This is another weakness.
The movie has characters with interesting backgrounds, but not all of them receive enough attention.
Lena is probably the best-developed character.
Alli is also important.
But some of the supporting characters feel more like people waiting to become victims.
That is a common problem in monster movies.
If the audience does not care about a character, their death will not have the emotional impact it should.
The best creature movies make the audience care about the people before the monster starts attacking.
Jaws is a great example.
Alien is another.
The audience needs to understand the characters as people.
Beware Boiúna gets part of the way there, but it could have gone further.
The Villain Is Not Always the Snake
One interesting aspect of the movie is that the human characters can be almost as threatening as the monster.
That creates a useful question:
Who is actually invading whose territory?
The snake is dangerous.
But the humans have entered the jungle.
Some are there to help.
Some are there for less noble reasons.
The film uses this contrast to create a moral question.
If humans disturb a natural environment, can they really be surprised when nature fights back?
That is one of the better ideas in the screenplay.
Does Beware Boiúna Have Good Scares?
Yes.
But it is not a nonstop jump-scare movie.
The horror comes from several different sources.
There are sudden attacks.
There are moments of anticipation.
There are disgusting images.
There are survival situations.
There is body horror.
And there is the fear of being trapped.
Viewers who dislike gore should be aware that the movie has an R rating for bloody violence, grisly images and language. Rotten Tomatoes lists those reasons as part of the film’s rating. (Rotten Tomatoes)
There is also a disturbing parasitic scene involving a botfly larva. CinemaBlend reported that director Mike P. Nelson discussed the practical effects used to create the scene, including prosthetics and physical effects. (Cinemablend)
That sequence will definitely not be comfortable for everyone.
The Gore Is Not the Main Point
Even though the movie contains bloody material, it does not depend entirely on gore.
The better scenes are about anticipation.
You know something is nearby.
You know somebody is in danger.
You do not know exactly when the attack will happen.
That uncertainty creates fear.
The movie also understands that sometimes what the audience does not see can be more disturbing than what it does see.
However, the film sometimes takes that idea too far by hiding the creature so much that viewers may become frustrated.
What Critics Are Saying
The critical reaction to Beware Boiúna is mixed.
Rotten Tomatoes lists the movie at about 67% from critics, based on the reviews currently collected there. (Rotten Tomatoes)
That is not a bad result.
It suggests that more critics liked the movie than disliked it, but there is no strong consensus that it is an outstanding horror film.
Some critics praised its atmosphere and suspense.
Others complained about the visual style.
The HoloFiles called it a nail-biting creature feature once it gets moving and praised its jungle atmosphere. (The HoloFiles)
Assignment X gave the film a B, describing it as a decent giant-snake movie and praising its scares, reversals and decision not to constantly show the creature. (Assignment X)
On the other hand, RogerEbert.com’s review was much more negative, criticizing the chaotic action, limited visibility of the snake and weak character development. (Roger Ebert)
The A.V. Club also criticized the film’s dark visuals and argued that the giant snake is difficult to see. (AV Club)
This split is useful because it tells potential viewers exactly what to expect.
The Movie’s Biggest Problem: You Want to See the Snake
This is perhaps the most ironic criticism.
The movie is called Beware Boiúna.
The whole marketing campaign is built around a giant snake.
So naturally, viewers want to see the snake.
The filmmakers know this.
They tease it.
They show pieces of it.
They hide it in darkness.
They reveal its movement.
But for some viewers, that will not be enough.
A giant monster movie should eventually give audiences the payoff they came for.
Beware Boiúna does provide bigger creature moments later in the film, but it takes time to get there.
If patience is not your strength, you may become frustrated.
The Movie’s Best Visual Idea
The mud sequence is probably the strongest visual idea in the film.
The character is surrounded by thick, dark mud.
Only part of her body is visible.
The environment becomes almost completely black around her.
Then the snake moves through that darkness.
It is simple.
But it works.
The HoloFiles specifically praised this sequence and described it as the highlight of the movie, especially because of the contrast between the dark mud and the bright greens of the surrounding jungle. (The HoloFiles)
This is the kind of scene that demonstrates what the movie could have been if it had used clearer geography and more controlled suspense throughout.
Beware Boiúna and Human Greed
The movie also has something to say about greed.
The Amazon is shown as a place where people come looking for resources.
Gold mining becomes part of that larger picture.
The story suggests that when humans enter an environment only to take from it, consequences can follow.
Boiúna becomes the ultimate symbol of that consequence.
The snake does not need to understand human politics.
It does not care about money.
It does not care about business.
It simply reacts to an intrusion.
That makes the creature an effective symbol.
Is Beware Boiúna a Monster Movie or an Environmental Movie?
It is both.
But it is mainly a monster movie.
The environmental themes are there, but they are not developed enough to turn the movie into a serious environmental drama.
That is probably the right decision.
If the filmmakers had spent too much time discussing environmental politics, the movie might have lost its horror momentum.
Instead, the environmental message stays in the background.
The audience can enjoy the snake movie while also thinking about the bigger issue.
The Final Act
Without giving away every major detail, the final part of Beware Boiúna increases the scale of the conflict.
The characters have to face the creature more directly.
The environment becomes part of the battle.
Human technology and tools are placed against the natural power of Boiúna.
This creates an interesting symbolic contrast.
Humans have machines.
Humans have weapons.
Humans have construction equipment.
But the snake has the environment.
The final confrontation therefore works on two levels.
It is a physical fight.
But it is also a battle between human control and nature.
RogerEbert.com’s review noticed this idea as well, pointing to the use of human tools against a creature whose habitat has been invaded. (Roger Ebert)
Is the Ending Satisfying?
The answer will depend on what you wanted from the movie.
If you wanted a giant-snake spectacle, you will probably find enough creature action in the later sections.
If you wanted a deeply developed story about the Amazon and its people, you may feel that the movie does not go far enough.
If you wanted a terrifying horror movie, some scenes work very well, while others are less effective.
The ending is not perfect.
But it does bring together the movie’s central ideas:
humans, nature, greed, survival and consequences.
Beware Boiúna Is Not a Perfect Horror Movie
It is important not to oversell the film.
There are weaknesses.
The camera can be too shaky.
Some scenes are too dark.
The editing sometimes makes the action difficult to understand.
Several supporting characters are underdeveloped.
The environmental themes could be deeper.
And the monster is hidden for so long that some viewers may wonder when they will finally get the giant-snake movie they were promised.
But these problems do not completely destroy the experience.
There is enough here for horror fans to enjoy.
What Makes the Movie Different?
The easiest answer is the mythology.
There have been many giant-snake movies.
There have been many Amazon jungle movies.
There have been many survival horror films.
But Beware Boiúna tries to combine those things with Amazonian folklore.
That gives the film its own identity.
It is not simply:
“What if an enormous snake escaped from a laboratory?”
Instead, the creature feels connected to the land.
That makes the story more mysterious.
Who Should Watch Beware Boiúna?
You should consider watching it if you enjoy:
- Giant monster movies
- Giant snake movies
- Jungle survival horror
- Amazon rainforest settings
- Creature features
- Mythological monsters
- Survival thrillers
- R-rated horror
- Practical creature effects
- Movies similar to Anaconda
- Movies inspired by Jaws-style suspense
It is especially suitable for viewers who enjoy movies where the environment itself creates danger.
Who Might Not Like It?
You may not enjoy Beware Boiúna if you dislike:
- Dark cinematography
- Shaky-camera action
- Slow-burn creature reveals
- Graphic violence
- Body horror
- Serious monster movies
- Environmental themes
- Stories where the creature remains hidden
If you want a bright, funny and straightforward adventure movie, this may not be the right choice.
Beware Boiúna Movie Rating
Here is my overall rating:
| Category | Rating |
|---|---|
| Story | 7/10 |
| Acting | 7.5/10 |
| Horror | 7.5/10 |
| Creature Design | 7.5/10 |
| Visuals | 6.5/10 |
| Suspense | 7.5/10 |
| Action | 6.5/10 |
| Characters | 6.5/10 |
| Atmosphere | 8/10 |
| Sound | 7/10 |
| Originality | 7/10 |
| Overall | 7/10 |
Final rating: 7/10
It is not a perfect giant-snake movie, but it is a worthwhile creature feature with a strong setting, a memorable monster and several genuinely tense scenes.
My Final Verdict on Beware Boiúna
Beware Boiúna is the kind of movie that reminds us why creature horror remains popular.
The basic idea is simple.
People enter a dangerous place.
Something enormous is waiting.
They have to survive.
But the film adds more to that formula.
It uses Amazonian folklore.
It explores human exploitation.
It creates an uncomfortable jungle environment.
It gives Kiana Madeira a strong central role.
And it turns Boiúna into a monster that feels connected to the environment rather than simply dropped into it.
The biggest problem is that the movie sometimes gets too dark and chaotic.
A horror movie can hide its monster.
That can be very effective.
But there is a point where hiding the monster stops creating suspense and starts becoming frustrating.
Beware Boiúna sometimes crosses that line.
Still, there are scenes that work extremely well.
The mud sequence is particularly memorable.
The practical approach to the creature is also interesting.
And the Amazon setting gives the movie an identity that many other giant-snake movies do not have.
The result is a solid horror adventure rather than a masterpiece.
If you are expecting another Anaconda, you should know that this is a darker and more serious movie.
If you are looking for a modern giant-monster thriller with an Amazonian setting, however, Beware Boiúna deserves a chance.
The movie does not completely reinvent the giant-snake genre.
But it does enough differently to make the journey worthwhile.
And perhaps the biggest compliment is this:
After watching the movie, you may think twice before looking at a dark stretch of water in the jungle.
Because you never know what could be underneath.
Beware Boiúna (2026) Trailer and Movie Information
You can watch the official trailer from Lionsgate here:
Watch the official Beware Boiúna trailer
For cast, release information and production details, you can also check:
Beware Boiúna on Rotten Tomatoes
Final Thoughts
Beware Boiúna (2026) is a solid giant-snake horror movie with a strong Amazon setting, good performances and some memorable survival sequences. It is not flawless, and the shaky camera and dark visuals may annoy some viewers, but the film has enough atmosphere and creature horror to keep fans interested.
The best thing about the movie is that Boiúna does not feel like just another giant snake. The creature is connected to the folklore, environment and central themes of the story.
For fans of horror and creature features, 7/10 feels like a fair final score.
Verdict: Worth watching if you love giant monsters, jungle horror and survival movies. (Rotten Tomatoes)