What animals prey on Alligator snapping turtle?

Alligator snapping turtles reach maturity at around 12 years old. Once maturity is reached, these turtles are virtually indestructible so logic would tell you, the natural predators would have to make there advances before that age. The mother can lay up to 55 eggs at a time, out of these (optimal) 55 eggs, only 10 or so will survive. Once these little turtles emerge, large water snakes such as the Florida Green Watersnake, American Alligators, American Crocodiles, or maybe even a large chicken hawk could eat a young Alligator Snapping Turtle. Though, there's not many cases where a wild animal cares to harass a fully grown Alligator Snapping Turtle (besides humans) because such an encounter would probably yield no positive results!