Beware Boiúna Review: A Jungle Monster with Missed Roar

There’s a moment in Beware Boiúna when the Amazon goes quiet and you feel the film holding its breath—only for the tension to snap in sudden, savage bursts. It’s a creature feature that wants to marry old-school survival dread to folkloric menace, yet often feels like a great idea hemmed in by choices that keep the beast from fully owning the screen.

Directed by Mike P. Nelson from a screenplay by Alan B. McElroy (based on a story by Tony Giglio and McElroy), the film follows a rescue team led into a remote corner of the rainforest. Kiana Madeira, Jessica Rothe and Logan Marshall-Green anchor the cast as volunteers and medics whose routine mission curdles into a fight for survival against a legendary, enormous snake—the Boiúna—drawn from local myth. The movie trades on damp, claustrophobic foliage, the hiss of wind through trees, and the slow reveal of something ancient and hungry.

Beware Boiúna is strongest when it trusts atmosphere. Nelson stages long, uncomfortable sequences that let fear breathe: the camera lingers, shadows widen, and you feel the characters’ smallness in a vast, indifferent wild. At its best, the film achieves a kind of primal cinema—raw, tactile, and occasionally terrifying.

But the film’s ambitions are a mixed bag. Many critics point to pacing that sags and a creature that, frustratingly, spends too much time offscreen or hidden by foliage. There are flashes of inventiveness—a few jolting set pieces and a sequence some reviewers call almost worth the ticket alone—but those moments sit amid uneven CGI and narrative fog that dilute the overall impact.

Critics remain divided. On Rotten Tomatoes the film sits at 54 percent from 46 reviews; Metacritic aggregates a 49 out of 100 from eight critics. TheWrap gave it a warm 76/100, calling it “really just a thoroughly scary movie about a very big snake.” Slant Magazine (63/100) praised Nelson’s rhythm and refusal to flatten the story into performative guilt, saying the film surprises in how it respects mood. IGN (60/100) found memorable moments and interesting tweaks to the genre’s formula but complained the movie overstays its welcome and hides the monster too often.

Other voices are less forgiving. The Globe and Mail (55/100) likened the film to a lethal Brazilian anaconda—at times thrilling, at times grotesque, and, crucially, too long. Next Best Picture and The A.V. Club both landed at 50/100, describing a project that attempts a gritty 1970s-style thriller feel but doesn’t fully deliver the necessary punch or clarity. RogerEbert.com’s Brian Tallerico (38/100) singled out one phenomenal sequence that almost redeems the film, while the Austin Chronicle was harshest (20/100), criticizing the weak VFX that leave the Boiúna embarrassingly obscured when it should be the star.

So where does Beware Boiúna sit in the monster-movie lineage? In the gray area between cult curiosity and missed potential. It’s a film that will satisfy viewers hungry for atmosphere and a folktale retold in slime and shadow. But for those expecting a consistently effective creature spectacle—one that lets its monster roar and linger—the movie may feel like a fistful of leaves when you were hoping for a strike.

If you love slow-burn jungle horror with occasional bursts of genuine dread, this one might bite. If you want a relentless, fully realized monster movie, you may find yourself impatiently waiting for the snake to show its teeth.