Home / Explore Your Zoo / Our Animals Our Animals The Zoo is home to more than 2,200 mammals, birds, reptiles, amphibians, and fish representing more than 270 different species, of which more than 60 are endangered. AmphibiansAmphibians can live both in fresh water and on land, although all amphibian species depend upon water for reproduction and to keep their skin moist. BirdsBirds are the only vertebrates that have feathers. All birds are warm-blooded, and they lay eggs. FishFish are aquatic, limbless vertebrate animals with gills and fins. The gills help fish breathe underwater, and the fins aid in movement. InvertebratesInvertebrates are the most abundant creatures on the planet — comprising more than 97% of all known animal species. MammalsMammals are warm-blooded vertebrates (animals with backbones) that nourish their young with milk. ReptilesReptiles are cold-blooded, usually egg-laying vertebrates (animals with backbones). Their skin is covered with scales or plates.