The tailless amphibians date back over 250 million years, and there have been over 4,800 different species identified as of 2014. Frogs live in an array of environments, including in bodies of water, underground, in trees, and on dry land. The amphibians are typically carnivorous, but some omnivorous types exist around the world. Frogs feed on small invertebrates or fruits, and they are prone to a large array of predators, including humans. In some cultures, frogs are considered a delicacy and are hunted.