Common Snapping Turtle (Chelydra serpentina): Facts and Range

Appearance

The snapping turtle looks rugged and prehistoric. Its upper shell, the carapace, is brown, tan, olive or almost black and carries three low ridges, called keels, that run from front to back. The keels are sharp in young turtles and wear down with age, so many old adults look fairly smooth and are often coated in mud or green algae. The rear edge of the shell is serrated like a saw.

The lower shell, the plastron, is unusually small and shaped roughly like a cross. It leaves much of the legs, neck and body exposed, which is why snappers cannot pull fully into their shells like many other turtles. Instead they rely on their bite for defense.

The head is big, with a hooked upper beak and small eyes set high and facing forward. The nostrils sit at the very tip of the snout, so a turtle lying in shallow water can breathe by poking just its nose above the surface, like a snorkel. Two small fleshy barbels hang under the chin. The neck is long and extremely flexible; the scientific name serpentina means “snake-like”.

The tail is thick and about as long as the shell, with a row of bony, saw-tooth scales along the top. The legs are powerful and end in long claws, useful for digging nests and climbing over logs. Males and females look alike, but males have a longer, thicker tail base.

How big do common snapping turtles get?

Most adults have a straight shell length of 25 to 47 cm (10 to 18.5 in), and a few approach 50 cm (20 in). Typical weights range from 4.5 to 16 kg (10 to 35 lb). One study of breeding turtles found an average shell length of about 28.5 cm (11.2 in) and an average weight of around 6 kg (13 lb).

Snapping turtles keep growing slowly throughout life, so the biggest individuals are old males. Almost all turtles above 10 kg (22 lb) are males. The heaviest wild common snapping turtle reported weighed about 34 kg (75 lb), while overfed captive turtles have reached about 39 kg (86 lb). In the northern part of its range, it is often the heaviest native freshwater turtle.

Habitat and range

The common snapping turtle has one of the largest ranges of any North American turtle. It is found from southern Canada, between the Prairie Provinces and Nova Scotia, south through the eastern and central United States to Florida and the Gulf Coast, and west to the foothills of the Rocky Mountains. Turtles in the Middle Rio Grande of New Mexico are probably native too.

It is a habitat generalist. It lives in ponds, lakes, slow rivers and streams, marshes, swamps, farm ponds, reservoirs and even roadside ditches, and some turtles enter brackish estuaries. Its favorite places have soft mud bottoms and plenty of water plants, where it can bury itself with only its eyes and nostrils showing. For more detail see where do snapping turtles live?.

Outside North America, snapping turtles have been introduced through the pet trade. In Japan a breeding population became established in Chiba Prefecture, where about 1,000 turtles were found in 2004 and 2005. Released pets have also turned up in several European countries, including Italy, where large adults have been caught in canals and lakes.

Two turtles from Mexico, Central America and northwestern South America were once treated as subspecies of the common snapper. They are now recognized as separate species, the Central American snapping turtle (Chelydra rossignonii) and the South American snapping turtle (Chelydra acutirostris). The common snapping turtle itself has no recognized subspecies.

What do common snapping turtles eat?

The common snapping turtle is an omnivore and an important scavenger. It eats almost anything it can catch and swallow: aquatic insects, worms, snails, crayfish, fish, frogs and tadpoles, snakes, small turtles, birds and small mammals. It also eats carrion and a surprisingly large amount of water plants and algae.

Adults are mainly ambush predators. A turtle lies still on the bottom or half-buried in mud, waits for prey to come close, then shoots its long neck forward and grabs it with an open mouth. Young turtles bite more weakly and forage more actively, searching the bottom for small invertebrates.

Snappers are often blamed for eating many ducklings and goslings. They do take young waterfowl at times, but studies suggest this effect is frequently exaggerated, and most of their diet is made up of invertebrates, fish, carrion and plants.

Behavior

Snapping turtles are solitary and spend most of their time in the water, usually resting on the bottom. They rarely bask on logs like painted turtles, although northern turtles do so in early spring, and sometimes they float at the surface with only the top of the shell exposed.

Their famous temper is mainly a land behavior. Out of the water, with its small plastron and no way to hide, a snapper defends itself by rising up, hissing and striking quickly. It can also release a musky smell from glands near the legs. In the water, the same turtle usually slips away or buries itself in mud when a swimmer approaches. The bite is strong but not record-breaking; how strong is a snapping turtle bite? explains the measurements and the myths.

The species is remarkably tough in cold weather. In the north, turtles spend the winter under ice at the bottom of ponds, and some stay active rather than hibernating fully. They can go for months without breathing air, slowing their metabolism and taking up small amounts of oxygen from the water through the lining of the mouth and throat.

Snapping turtles also travel overland more than people expect. They move between ponds when water dries up, when food runs short or when an area is crowded, and experiments suggest they can sense the Earth’s magnetic field, which may help them find their way.

Reproduction and life cycle

Mating can take place from April to November, and females can store sperm for several seasons. The main nesting season is in late spring and early summer, peaking in June and July. Females leave the water and walk overland, sometimes a long distance, to find sunny, sandy or loose soil, often on road shoulders, railway banks, gravel pits and gardens. This is why so many snappers are seen on roads at that time of year; see why do turtles cross roads?.

The female digs a flask-shaped hole with her hind feet and lays about 25 to 80 round, leathery eggs, each roughly 26 to 28 mm (about 1 in) across, about the size of a ping-pong ball. She covers the nest and returns to the water, giving no further care. Incubation lasts about 9 to 18 weeks, depending on temperature, and in cold climates the hatchlings may stay in the nest over winter.

As in many turtles, temperature decides the sex of the young. Cool and very warm nests produce females, while intermediate temperatures produce males. Before leaving the nest, hatchlings have been recorded making soft clicking sounds.

Most eggs and hatchlings never survive. Crows, raccoons, skunks, foxes and mink dig up many nests, using sight, the feel of disturbed soil and the scent left by the female. Turtles that survive mature slowly: at about 12 years in the south and 15 to 20 years in the north.

Lifespan

Snapping turtles follow a “slow life” strategy: few young survive, but adults live a long time and breed many times. Animal Diversity Web estimates that wild snappers live up to about 30 years, and the longest recorded captive lifespan is about 47 years.

Long-term mark-and-recapture studies in Algonquin Park in Ontario, Canada, suggest that some wild adults may live much longer, possibly beyond 100 years. Such ages are estimates, because turtles cannot be aged precisely once they are fully grown.

Predators and threats

Large adults have very few natural enemies, and old males have a very low yearly death rate. Hatchlings and juveniles are eaten by herons, bitterns, hawks, owls, raccoons, American bullfrogs, large fish and snakes. Adults are occasionally killed by northern river otters in winter, and also by coyotes, black bears and American alligators.

People are the main threat. Road traffic kills many nesting females every year, and because each population depends on long-lived adults, losing even a few breeding females can cause a decline. One study in southwestern Ontario followed a population near a busy road that fell from 941 to 177 turtles between 1985 and 2002. Other threats include harvest for meat, collection for the pet trade, pollution and the loss of wetlands and nesting sites.

Conservation status

The IUCN Red List classes the common snapping turtle as Least Concern, in an assessment published in 2025. It is still common in many areas and tolerates farm ponds, canals and urban wetlands.

The species is protected more strictly in some places. In Canada it has been listed as Special Concern under the Species at Risk Act since 2011, and several US states limit or ban harvesting. International trade is regulated under CITES. Road fencing and turtle tunnels, nest protection and public reporting of turtle sightings all help local populations.

Myths and facts

Myth: a snapper can bite off a finger. Its jaws are strong enough to cause a serious injury, but no proven case of a common snapping turtle biting off a human finger or toe is known. Cases of finger amputation involve the much larger alligator snapping turtle.

Myth: once it bites, it will not let go until it thunders. This is old folklore of unknown origin. A turtle releases its grip when it no longer feels threatened.

Myth: snapping turtles attack swimmers. In the water they almost always avoid people. Curious turtles occasionally bump a wader’s leg, but attacks on swimmers are not a real risk.

Myth: it is fine to lift a snapper by its tail. Lifting a turtle by the tail can injure its tail and spine. The safest choice is to leave it alone or contact local wildlife authorities.

Relationship with people

The snapping turtle has a long place in North American culture. A famous political cartoon from 1808, protesting the Embargo Act of 1807, showed a snapping turtle called “Ograbme” (“embargo” spelled backward) biting a merchant. In 2006, schoolchildren chose it as the state reptile of New York.

Snapping turtles have long been eaten in turtle soup, and they are farmed in parts of China. Because they live long and feed near the top of freshwater food chains, they can build up pollutants in their bodies. Many people also meet them each summer on roads and in gardens, where nesting females are best given space. The difference between this species and its giant relative is covered in alligator snapping turtle vs common snapping turtle.