“Anacondas are a perfect killing machine,” says Jon Voight, who plays a snake hunter with a dubious accent, early in Anaconda. “They strike, wrap around you, hold you tighter than your true love. And you get the privilege of hearing your bones break before the power of the embrace causes your veins to explode.” Yes, it’s that kind of movie. The film’s nominal protagonists are documentary filmmaker Jennifer Lopez and her crew of B-listers (Eric Stolz, Ice Cube, a prestardom Owen Wilson) who are traveling down the Amazon in search of a reclusive tribe, but they’re mostly there to be killed, in descending order of obnoxiousness. The real star is the titular 40-ft.-long snake, which keeps finding new and more impressive ways to pop out from nowhere, strangle people and them swallow them whole. This habit sets it apart from Voight, who prefers to chew the scenery before swallowing it.