Definition: The word "amphibium" comes from Greek meaning "living animal," indicating that they are both a living organism (like fish) and a non-living material (like mud or sand). Definition: Amphibians belong to the family Bufonidae, which include frogs, toads, salamanders, and voles. They have three limbs and lungs for breathing, as opposed to two in mammals. This makes them better adapted for aquatic environments where water is often abundant. Amphibians are considered a living organism because they are capable of developing organs, including hearts and nervous systems, that allow for growth, reproduction, and the ability to respond to stimuli like touch or sound.