Snapping turtles can distinguish male from female through the following methods:

1. Observe the tail: The tail of male snapping turtle is very thick, while the tail of female snapping turtle is relatively thin and short.

2. Observe the reproductive organs: The reproductive organs of male snapping turtles are farther from the plastron, while the reproductive organs of female snapping turtles are closer to the plastron.

3. Observe the mouth: Male snapping turtles have hooks in their mouths, but male snapping turtles do not.

4. Observe the tongue: Usually the tongue of male snapping turtles is light red, much lighter than that of female snapping turtles.

5. Observe the back texture: The back texture of female snapping turtles is relatively clear and black, while the texture of male snapping turtles is rough and looks a little yellow.