Amphibians are vertebrates distinguished by their ability to live in both aquatic and terrestrial habitats. Amphibians include frogs toads, salamanders, newts, and caecilians. The name, derived from the Greek "amphibios" meaning "living a double life," reflects this dual ability. Most species live part of their lives underwater and part on land and reproduce by laying soft eggs in masses or long strands. Most females lay eggs in the water, and the offspring live in the water using gills to breathe, as fish do. As the offspring grow, most develop legs and lungs that allow them to move onto land. This big change is called "metamorphosis." Most amphibians have delicate, thin skin that aid in the animal's ability to breathe. An amphibian's thin skin also makes it sensitive to pollution and changes in climate. Amphibians are ectothermic or "cold-blooded," like fish and reptiles. Ectothermic animals cannot regulate body temperature internally. You can visit the Philadelphia Zoo's amphibians in the Reptile and Amphibian House.
Amphibians are in the midst of a crisis that has been compared to the fall of the dinosaurs, with more than one third of all species in danger of extinction, disappearing more quickly than any other species on Earth. Learn about what Philadelphia Zoo is doing to help save amphibians.
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