The Snapping Turtle (Chelydra serpentina) is also called: snapper, testudo serpentine
These turtles are the largest freshwater turtle in Canada and the most prehistoric-looking turtle species. Their long tail has a series of triangular spikes along the top that are reminiscent of those of a stegosaurus. Their carapace (upper shell) is tan or olive to black in colour and often covered with algae such as this one.
This female was observed burying her eggs (after laying about 30 of them).
Photo taken in Ottawa, ON Canada (Summer of 2011)