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Common snapping turtle
The common snapping turtle (''Chelydra serpentina'') is a large freshwater turtle of the family Chelydridae. Its natural range extends from southeastern Canada, southwest to the edge of the Rocky Mountains, as far east as Nova Scotia and Florida. This species and the larger alligator snapping turtle are the only two species in this family found in North America (though the common snapping turtle, as its name implies, is much more widespread).
The common snapping turtle is noted for its combative disposition when out of the water with its powerful beak-like jaws, and highly mobile head and neck (hence the specific name ''serpentina'', meaning "snake-like"). In water, they are likely to flee and hide themselves underwater in sediment. Snapping turtles have a life-history strategy characterized by high and variable mortality of embryos and hatchlings, delayed sexual maturity, extended adult longevity, and iteroparity (repeated reproductive events) with low reproductive success per reproductive event. Females, and presumably also males, in more northern populations mature later (at 15–20 years) and at a larger size than in more southern populations (about 12 years). Lifespan in the wild is poorly known, but long-term mark-recapture data from Algonquin Park in Ontario, Canada suggest a maximum age over 100 years.
==Anatomy and morphology==
''C. serpentina'' has a rugged, muscular build with ridged carapaces (though ridges tend to be more pronounced in younger individuals). The carapace (upper shell) length in adulthood may be nearly , though , is more common. ''C. serpentina'' usually weighs . Per one study, breeding common snapping turtles were found to average in carapace length, in plastron length and weigh about .〔Iverson, J. B., Higgins, H., Sirulnik, A., & Griffiths, C. (1997). ''Local and geographic variation in the reproductive biology of the snapping turtle (Chelydra serpentina)''. Herpetologica, 96-117.〕 Males are larger than females, with almost all animals weighing in excess of being male and quite old, as the species continues to grow throughout life.〔 Any specimen above the aforementioned weights are exceptional, but the heaviest wild specimen caught reportedly weighed . Snapping turtles kept in captivity can be quite overweight due to overfeeding and have weighed as much as . In the northern part of its range, the common snapping turtle is often the heaviest native freshwater turtle.〔(Virginia Herpetological Society: Eastern Snapping Turtle ''Chelydra serpentina serpentina'' )〕
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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