Crocodiles first appeared around 230 million years ago and have survived for over 200 million years. They can be found living in tropical regions around the world and come in various sizes, weighing between 40 to 1000 kg and measuring 1.5 to 6 meters long. Crocodiles have relatives like crocodiles, gavials, caimans, and alligators. They are surprisingly fast runners and can reach speeds of up to 14 km/h on land. Crocodiles eat a variety of prey, lay eggs to breed, and sunbathe to regulate their body temperature. While humans once worshipped and feared crocodiles, they now protect them due to past harm.