September is hatching time — but don’t look to the trees for these babies: they are common snapping turtles! Every spring, in late May or early June, a large female snapper lumbers out of the Snake River, digs a nest nearby and lays between 20-50 (or more) round, leathery eggs. She picks a sunny location, and when she’s finished, she returns to the river to let the sun warm and incubate her egg clutch.
Three months later, the eggs hatch and the baby snappers dig their way to the surface. (We couldn’t locate the nest site this year.) Our neighbors, Ed and Melinda, who live year-round next to Pine County’s Snake River, say the snappers usually hatch on September 2nd. Some years there’s a slight variation; this year it was September 3rd and I was there to see part of it.
The babies take off in several directions, but generally head toward the river or the swamp across the road often stopping to rest. It’s a slow, dangerous journey from nest to water for the half-dollar-sized hatchlings. According to the Minnesota Department of Natural Resources, between 60 and 100 percent of each egg clutch is lost to predators. Baby snappers are a favorite food of many woodland creatures, such as herons, fox, skunks, mink and raccoons. Once they reach the water, they are vulnerable to many other predators, such as fish, frogs, northern water snakes, some birds and other turtles.
Those who survive infancy take at least 5-to-7 years to reach adulthood. Most settle in quiet water with a muddy bottom, such as a pond, stream, marsh or slow-moving river. They feed on crayfish, frogs, small birds and mammals, insects and many types of aquatic plants. They also scavenge dead plants and animals, which helps to clean their aquatic environment.
As adults, snappers typically measure at least 8-to-14 inches across the greenish-brown carapace or upper shell, and weigh 35 pounds or more. They have one main predator: humans who hunt them for their meat.
Snapping turtles are shy by nature. They are often docile if encountered in the water and will sink and swim away. However, on land they are vulnerable because they cannot completely retract into their shell. That’s because the plastron or lower shell is much smaller than that of most turtles. The smaller size makes it much easier for a snapper to move its head and neck, but provides less protection. If they are harassed and feel threatened, they may become aggressive, lunge forward and bite very hard.
Scientists believe that common snappers evolved in North America about 90 million years ago during the Cretaceous period. They outlived the dinosaurs and survived several ice ages. Today they populate North America from the Atlantic Ocean to the Rocky Mountains, and from southern Canada to the Gulf of Mexico. Humans are the main threat to their long-term survival. In addition to being hunted for their meat, many are killed by motorists during the nesting season when females and hatchlings cross roads moving to and from water.