The great alligator snapping turtle.

Alligator snapping turtles get their name from their powerful jaws and the ridges of their shells that resemble alligator skin. Medusa, our resident alligator snapping turtle, enjoys spending most of her time in the water, buried in the mud. She can hold her breath up to three hours which is why you may not see her during your visit! | Gulfarium Marine Adventure Park

Alligator Snapping Turtle vs Common Snapping Turtle: What Are The Differences?

Snapping Turtle