The hissing sound produced by a bull snake when air is forced through the bisected glottis is amplified thanks to a well‑developed epiglottis.

“The North American bull snake (Pituophis melanoleucus), for example, is well known among herpetologists for its ability to emit a very loud bovine grunt that can be heard up to 100 feet (30 m) away. This remarkable bellowing noise is made possible by a peculiarity of this snake’s anatomy. The bull snake possesses an exceptionally well-developed epiglottis that greatly enhances the sound produced when air is being forced though the glottis.” (Shuker 2001:154)

Last Updated May 2, 2020