The largest number of carnivores are mammals, found in the order Carnivora, which includes 17 families of hypercanivores. Lions and other felines, hyenas, bears, dogs, wolves, weasels, seals, raccoons, foxes, otter and walruses are some members of this order. Other carnivores among mammals include some species of Australian marsupials, such as the Tasmanian devil, which preys on wombats and other small mammals; and bats, which mostly eat insects, but can also feed on small birds, like the greater noctule bat (Nyctalus lasiopterus) and the blood of bigger mammals, like the vampire bat (Desmodus rotundus). some species of whales and dolphins are also carnivores, as they eat fish and crustaceans.
Birds of prey, such as falcons, owls and eagles, pelicans and herons feed on insects, small birds, mice, hares and other mammals, while gulls and penguins eat mainly fish and other small marine animals. Among the reptiles, carnivores are abundant, including members of the order Crocodilia, such as caymans and crocodiles; snakes, which have a varied meat diet, ranging from small lizards and mammals to birds and insects; some species of lizards and most aquatic turtles, require a diet with more than 60 percent of meat.
The most notorious carnivore fish are sharks and piranhas, but other meat-eaters include marlin, tuna and salmon species, which have a varied diet, including small fishes and insects, as well as some species of catfish, which feed on other fish. Among the amphibians, most species of toads, frogs and salamanders are big insect eaters during their adult lives.
Some species of crustaceans in the genus Birgus, such as the coconut crab, feed on turtle hatchlings, carrion and small size crustaceans. Octopi, squid and other members of the group Mollusca; most scorpions and spiders, as well as in wasps and other insects consume small animals. All species of sea stars and jellyfish also eat some meat from small crustaceans.