Heterodon is a genus of harmless colubridsnakesendemic to North America.[1] They are stout with upturned snouts and are perhaps best known for their characteristic threat displays. Three species are currently recognized.[2] Members of the genus are commonly known as hognose snakes, hog-nosed snakes,[3]North American hog-nosed snakes,[2] and colloquially puff adders[4] (though they should not be confused with the venomous African vipers of the genus Bitis).
Adults grow to 30–120cm (12–47in) 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.[3]
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.[5]
Hognose snakes' most distinguishing characteristic is their upturned snout, which is believed to aid in digging in sandy soils.
Behavior
When threatened, the hognose snake will flatten its neck and raise its head off the ground, similar to a cobra, and hiss.[citation needed] It may sometimes feign strikes, but is extremely reluctant to bite. This behavior has earned the hognose snake several nicknames, such as "blowing adder", "flathead", "spreading adder", or "hissing adder". If this threat display does not work to deter a would-be predator, the hognose snake will often roll onto its back and play dead with its mouth open and tongue lolling, going as far as to emit a foul musk from the cloaca. Emission of cloacal musk is considerably less likely than in many other species. If the snake is rolled upright while in this state, it will often roll over again as if to insist that it is really dead.[6]
Unfortunately due to their appearance and impressive defensive display, hognose snakes are commonly mistaken to be copperheads and subsequently killed. This is especially true in the southeastern regions of the United States, where copperheads are especially prevalent by comparison to other areas it shares with the hognose.[7]
Feeding
Hognose snakes live chiefly on toads and can neutralize that animal’s poisonous skin secretions physiologically.
Captivity
Hognose snakes are frequently found in the exotic pet trade. H. nasicus are often considered to be the easiest to care for, and captive-bred stock is easily found. H. platirhinos is commonly found, but their dietary requirements can be a challenge for some keepers.
Hognose snake is a common name for several unrelated species of snakes with upturned snouts, classified in two colubrid snake families and one pseudoxyrhophiid snake family.
The eastern hog-nosed snake, is a species of mildly venomous rear-fanged snake in the family Colubridae. The venom is specifically adapted to amphibian prey and is basically harmless to humans, although some people are allergic to it and experience local swelling and other symptoms. The species is endemic to North America. There are no subspecies that are recognized as being valid. This species prefers habitats with sandy soils and a combination of grass fields and forest edges. They come in many different colorations and have the identifiable upturned "snout". They can be found in captivity but are a relatively difficult species to keep due to a specialized diet of toads. As with other Heterodon species, they have a distinctive threat reaction of first bluffing by striking with a closed mouth and then pretending to die if this fails to deter the threat.
The western hognose snake is a species of snake in the family Colubridae. The species is endemic to North America. There are three subspecies that are recognized as being valid, including the nominotypical subspecies.
Chunk head may refer to:
Deaf adder may refer to:
Sand adder may refer to any of the following snakes:
Red snake may refer to:
Agkistrodon contortrix mokasen was formerly a venomous pit viper subspecies found in the eastern United States. However, recent taxonomic changes do not recognize the northern copperhead as a valid taxon.
Heterodon simus, commonly known as the southern hog-nosed snake, is a harmless snake species endemic to the southeastern United States. No subspecies are currently recognized.
Western hog-nosed viper may refer to:
Wyoming is home to 12 amphibian species and 22 species of reptiles.
Xenodon pulcher is a species of fossorial snake in the family Colubridae. It is found in southern South America.
References
↑ Platt, Dwight R. 1983. Heterodon. Catalogue of American Amphibians and Reptiles. Society for the Study of Amphibians and Reptiles, 351: 1-2.
1 2 Wright AH, Wright AA. 1957. Handbook of Snakes of the United States and Canada. Ithaca and London: Comstock Publishing Associates. (7th printing, 1985). 1,105 pp. (in 2 volumes) ISBN0-8014-0463-0. (Genus Heterodon, p. 296 + Figure 25 on p. 81 + Map 28 on p. 298.)
↑ Behler JL, King FW. 1979. The Audubon Society Field Guide to North American Reptiles and Amphibians. New York: Alfred A. Knopf. 743 pp. LCCCN 79-2217. ISBN0-394-50824-6.
Goin, Coleman J.; Olive B. Goin; George R. Zug. (1978). Introduction to Herpetology, Third Edition. San Francisco: W.H. Freeman. xi + 378 pp. ISBN0-7167-0020-4. (Heterodon, pp.149, 167, 328-329.)
Latreille, P.A.InSonnini, C.S. and P.A. Latreille. (1801). Histoire naturelle des reptiles, avec figures dessinées d'apres nature; Tome IV. Seconde Partie. Serpens. Paris: Crapelet. 410 pp. (Genus Heterodon, p.32.)
Schmidt, K.P., and D.D. Davis. 1941. Field Book of Snakes of the United States and Canada. G.P. Putnam's Sons. New York. 365 pp. ("THE HOG-NOSED SNAKES (Heterodon)", pp.115–118, Figures 25. & 26. + Plate 11 on p.331.)
Zim, H.S., and H.M. Smith. 1956. Reptiles and Amphibians: A Guide to Familiar Species. A Golden Nature Guide. Simon and Schuster. New York. 160 pp. ("HOG-NOSED SNAKE", "Heterodon nasicus and H. platyrhinos [sic]", pp.81, 156.)
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