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

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“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 through the glottis.” (Shuker 2001:154)

The Hidden Powers of Animals: Uncovering the Secrets of NatureJanuary 1, 1970
Dr. Karl P. N. Shuker

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Black Pine SnakePituophis melanoleucusSpecies

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