Many people think a snake’s forked tongue is creepy. Every so often, the snake waves it around rapidly, then retracts it. Theories explaining the forked tongues of snakes have been around for ...

Xavier Glaudas was watching a video of one of the world's deadliest snakes when something made him pause and rewind. “I couldn’t believe what I was seeing,” he says. On the film, a puff adder (Bitis ...