American alligator and saltwater crocodile who more aggressive?

The most aggressive in both captivity and in the wild would be the salt water crocodile. By nature, the american alligator is not an aggressive species and will usually leave humans alone, except when a mother is defending her nest. In places like Florida where the human population increases and the habitat for alligator decreases, interaction between alligator and human increases. And when an alligator looses its fear of humans, it can become aggressive. Unprovoked attacks has occur. But still the salt water crocodile is still the most aggressive of all the crocodilians and the most aggressive of all the reptiles.