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''Heterodon nasicus'', commonly known as the western hognose snake, is a species of harmless colubrid endemic to North America. Western hognose snakes are relatively small, stout-bodied snakes found throughout the Great Plains states of the United States from Canada to Mexico. Their color and pattern is highly variable from subspecies to subspecies, although most specimens appear much like the infamous rattlesnake to the untrained eye. This optical bluff, used in conjunction with a wide array of other clever defense tactics, makes these snakes unique among North American serpents. Although there is still debate whether ''Heterodon'' is mildly venomous or nonvenemous with toxic saliva, it is generally agreed that the species is indeed venomous. Regardless, the extremely rare bite from this rear-fanged snake is of no medical importance to humans. Symptoms range from negligible to localized slight swelling and itching. As with any animal though, care must be taken not to receive a bite as allergic reactions and infection are always a slight possibility. Males are considerably smaller than females, with adult lengths rarely exceeding 15-20 inches. These snakes get their common name from the modified rostral (nose) scale that is formed in an upturned manner, providing a very "hog-like" look. Additionally, this adaptation makes these snakes adept burrowers, which is a useful skill when hunting or seeking refuge from the elements. ==Interaction with humans== Even though this snake does not cause harm to humans, people are the snake's biggest threat. People often mistake the hognose for a rattlesnake, killing it to protect themselves. Educating people that the hognose snake is harmless will increase the survival of the species. The eastern hognose snake (''Heterodon platirhinos'') is classified as a threatened species in some regions of its range and is therefore protected under those state's laws. Because the eastern and western species of hognose snakes are so similar in appearance, it would be wise to leave all hognose individuals alone in the wild. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Western hognose snake」の詳細全文を読む スポンサード リンク
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