Cuvier's Dwarf caiman (Paleosuchus palpebrosus) is the smallest of the crocodilians only reaching a length of about 3 feet. This make them quite popular as pets as unlike other crocodilians they stay a somewhat manageable size. They tend to be very aggressive for crocodilians in captivity, but have bred in captivity and can live up to 40 years. They tend to live in rivers and streams in north eastern South America it is theorized that their small size helps them to navigate through faster running water. They have the most bony plates of any crocodilian and they have some of the strongest stomach acid found in any known vertebrate.