How do you tell the difference in a male and female alligator?

Male crocodiles are bigger,while females are smaller.

Females guard the nest and young, for a while.

males have a penis,females do not

_____

Actually... that's not accurate.

Males tend to be really aggressive towards their nest or territory. And one way to tell a male crocodile from a female one is to stick your finger inside its cloaca.