Such predators include jaguars, ocelots, tayras, boa constrictors, caimans, and collared peccaries. Species from this area on exhibit include anacondas, piranhas, spiders, freshwater stingrays and caimans. The broadest snouted modern crocodilians are alligators and larger caimans. These sole remaining pseudosuchians are the crocodilians&colon; crocodiles, alligators, caimans, and gharials. There are several records of American crocodiles killing and eating spectacled caimans in South America. These are black caimans, smooth-fronted caimans, Cuban crocodiles and broad-snouted caimans. Cuvier's dwarf caiman seems relatively tolerant of cool water compared to other species of caimans. The family Alligatoridae of crocodylians includes alligators and caimans. The caimans also hunt insects, birds and small mammals and reptiles. Scars on Amazon river dolphins suggest they may occasionally be attacked by black caimans. The jaguar and the giant otter may prey on caimans in South America. This bony plate is present in caimans, but is rarely present in the American alligator. Adult Cuvier's dwarf caimans are usually found singly or in pairs. Their closest relatives are the other caimans in the subfamily Caimaninae. Humans hunt black caimans for leather or meat.