Reptiles
Common Snapping Turtle
Chelydra serpentina · also called common snapping turtle, snapper
The common snapping turtle is the heavy, prehistoric-looking turtle of North American ponds and ditches — a hooked jaw, a spiky tail, a shell often furred with algae. Its fearsome reputation is half-earned: it is genuinely formidable on land, where it cannot hide, and almost entirely peaceable in the water, where it can.
Overview
Common snapping turtles live in almost any permanent fresh water — ponds, lakes, marshes, slow rivers, drainage ditches — across eastern and central North America, and tolerate brackish water and cold well. They spend most of their time walking along the bottom or lying buried in mud and leaf litter with only the eyes and nostrils exposed, ambushing prey and scavenging. They are strong swimmers but rarely bask in the open the way pond turtles do.
A body without armour
The snapper’s lower shell is reduced to a narrow cross, leaving its thick limbs, long neck, and tail exposed. This keeps it light and agile in mud and water — good for an ambush hunter — but it removes the option of pulling inside a closed shell. So on land the turtle defends itself by attacking: it rears up, gapes, hisses, and delivers a fast, far-reaching lunge and bite with that mobile neck. In the water it does none of this and simply retreats.
Diet
Common snappers are omnivores. A surprisingly large fraction of the diet is aquatic vegetation, alongside fish, frogs, invertebrates, snakes, small birds and mammals, and carrion — they are important cleaners of dead animals in freshwater systems.
Nesting and roads
In late spring and early summer, females leave the water and travel overland — sometimes hundreds of metres — to dig nests in loose soil, roadsides, and gardens. This journey is the most dangerous time in a snapper’s long life: road mortality of nesting females is a leading local threat, because turtles are slow to mature and the loss of breeding adults is hard to replace.
Status
The common snapping turtle is Least Concern and remains widespread and abundant. The main pressures are road deaths, wetland loss, and commercial harvest for meat in some US states, where unregulated collection can deplete local populations of a slow-reproducing animal.
Common Snapping Turtle: common questions
How dangerous is a snapping turtle bite?
On land, a large snapper can give a serious bite — enough to cause deep cuts, crush a finger, or sever a fingertip — and it strikes fast, whipping its long neck out and around much further than people expect. But the common snapping turtle's bite force is not extraordinary; measured values are around a fifth of a large alligator snapping turtle's and less than an adult human's. The key facts are that in the water these turtles are not aggressive and simply leave, and that bites almost always happen when someone picks one up, steps on one, or tries to move it off a road.
Why can't a snapping turtle hide in its shell?
Its lower shell, the plastron, is greatly reduced — narrow and shaped like a cross — leaving large areas of the legs, neck, and tail permanently exposed. This makes the turtle lighter and more mobile in water and mud, which suits its ambush lifestyle, but it means the animal has no armoured box to retreat into. Its defence on land is therefore active — it faces the threat, gapes, hisses, and lunges. In the water, where it feels safe, it does none of this.
What should I do if I find one crossing a road?
If you choose to help it, move it in the direction it was already heading — turning it back just sends it into the road again later. Never pick a snapping turtle up by the tail, which can dislocate its spine. The safer methods are to slide a car mat or piece of cardboard under it and drag it across, or to grip the back edge of the top shell above the back legs (well clear of the head, which can reach much of the way back) and carry it low to the ground. Many females are killed on roads during the June nesting migration.
Are common and alligator snapping turtles the same thing?
No, they are different species in different genera. The common snapping turtle (Chelydra serpentina) is widespread, more active, more omnivorous, forages by moving around, and has a relatively smooth shell and a long tail. The alligator snapping turtle (Macrochelys) is a much larger, heavier, Southeastern US species with a deeply ridged shell, a hooked beak, and a worm-like lure on its tongue that it uses to fish while sitting motionless. The alligator snapper has one of the strongest turtle bites; the common snapper does not.