Tetrapods are a group of animals that have four limbs. This group includes amphibians, reptiles, birds, and mammals. Tetrapods evolved from fish around 375 million years ago, adapting to life on land. Their limbs are structured to support their weight and allow for movement in various environments. The term "tetrapod" comes from the Greek words for "four" and "foot." These animals typically have a backbone and are part of the larger group called vertebrates. Tetrapods can be found in diverse habitats, from forests to deserts, and they play essential roles in their ecosystems.