How many types of crocodiles are there on Earth?

Yacare caiman- this is the smallest species of caimans. Adult males weigh up to 50 pounds and grow 8 ft long.

Common caiman- Adult males weigh up to 128 pounds and grow 10 ft long.

Black caiman- This is the largest species of caimans. Adult males can weigh up to 2400 pounds and grow 20 ft long.