Crocodiles first appeared in the Late Triassic. They are aquatic reptiles with streamlined bodies, built for swimming. This sometimes lethargic creature can be very fast in or out of the water, but only for relatively short distances. They have the strongest jaw in the modern animal kingdom (5000 psi), and will eat almost anything. Crocodiles live mainly in or near freshwater, however it is not uncommon to find them in brackish and occasionally salt water. All of this has proven to be a winning combination for this successful predator, which can still be found throughout the tropics.