The axolotl is a unique aquatic salamander native to the lakes of Mexico, particularly Lake Xochimilco. Unlike most amphibians, axolotls retain their juvenile features throughout their lives, a phenomenon known as neoteny. They have external gills, a wide head, and a long body, making them easily recognizable. Axolotls are known for their remarkable regenerative abilities, allowing them to regrow lost limbs and even parts of their heart and brain. They are often kept as pets and are also used in scientific research due to their regenerative properties, contributing to studies in fields like regenerative medicine and developmental biology.