Caimans aren't the biggest reptiles. In fact, the biggest caiman is 4ft. smaller than the biggest alligator. Caimans are also very different from alligators. The caiman, unlike the alligator has bony plates embedded in the belly. Caimans are also a lot more active than alligators.
Caimans usually feed on small fish, insects and snails.
Some of the larger caimans eat mammals now and then. Caimans have very little enemies. The Jaguar is known to kill young or half grown caimans. The aneadea is also known to kill some species of caimans. I hope you learned a little bit more about caimans.