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. These animals typically have a backbone and are part of the larger clade called vertebrates. Tetrapods breathe air, and many have developed unique adaptations for survival, such as wings in birds for flight and fins in some amphibians for swimming. Their diverse forms and functions make them a vital part of ecosystems.