Rattlers

A noted herpetologist investigating a series of fatal rattlesnake attacks on people discovers that the reptiles' brains have been affected by a mysterious nerve gas that was disposed of in the Mojave Desert by the military.

Rattlers is a 1976 horror movie directed by John McCauley, starring Sam Chew Jr., Ronald Gold, Elisabeth Chauvet. It holds an IMDb rating of 4.1/10 from 1,171 votes and runs 1h 22m.