Some snake species hiss when they feel threatened. Snakes don’t have vocal cords. They are able to hiss by forcibly expelling air through the glottis, a structure in their throat. The glottis is a hole at the bottom of the snake’s mouth that connects to its windpipe. In mainstream films and even some documentaries, the hissing sound is added to snake footage while these reptiles tongue flick. In reality, snakes don’t produce hissing sounds when they tongue flick. #livingzoology #venomoussnakes #

1.1K reactions · 22 comments | Meet the glottis, a tiny yet vital...