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Heterodon
''Heterodon'' is a genus of harmless colubrid snakes endemic to North America. They are stout with upturned snouts and are perhaps best known for their characteristic threat displays. Three species are currently recognized.〔 Members of the genus are commonly known as hog-nosed snakes,〔 North American hog-nosed snakes, and sometimes puff adders (though they should not be confused with the venomous African vipers of the genus ''Bitis'').
==Description==
Adults grow to 30–120 cm (12-47 in.) in total length. The body is stout and the head is slightly distinct from the neck. The latter is expandable, the anterior ribs being capable of spreading to flatten that portion of the body, similar to a cobra. The tail is short and the anal scale divided. The dorsal scales are keeled with apical pits in 23-25 rows. The rostral scale is projecting, upturned, recurved and keeled dorsally. There are usually 1-20 accessory scales (azygous) that separate the internasals and the prefrontals. A subocular ring is present with 8-12 ocular scales. There are 7-8 upper labials and 9-13 lower labials. The ventrals number 114-152 and the subcaudals 27-60.〔
The color pattern is extremely variable. ''H. nasicus'' tends to be sandy-colored with black and white markings, while ''H. platirhinos'' varies from reds, greens, oranges, browns, to black depending on locality. They are sometimes blotched and sometimes solid-colored.
Members of this genus have enlarged rear maxillary teeth, two on each side, and possess a slightly toxic saliva. In a few cases involving bites from ''H. nasicus'', the symptoms reported have ranged from none at all to mild tingling, swelling and itchy skin. Nevertheless, they are generally considered to be very harmless to humans.〔(Are Hognosed Snakes Venomous? ) at (Hognose.com ). Accessed 2 August 2008.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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