One who studies reptiles, a reptile specialist.(noun)
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Use "herpetologist" in a sentence
"It was also the lair of an exceptionally large rattlesnake which pleased Dudley, a thwarted herpetologist, and showed once again on the flanks of an eroding knoll."
"* Zach Walker, a herpetologist with the Wyoming Game and Fish Department ... said he also has heard that when a dog gets bitten by a rattlesnake and survives, the dog is henceforth immune to the venom."
"A herpetologist can tell you what you want to know."