Amphibians are cold-blooded (ectothermic) vertebrates.  So, their body temperature stays at or near the temperature of the ground or air and they have a spine.  All the amphibian species you will learn about here, will grow from an egg to a juvenile while underwater.  While they are in that aquatic form, they have no lungs; they must get oxygen from the water.  When they change form (metamorphose) into an adult, they acquire lungs that can get oxygen from the air. 

Many amphibians must keep their skin moist even after they migrate away from the vernal pools as adults.  Mammal burrows offer a damp place to hide and hunt for spiders, insects and other prey.  What reptiles might also be hiding and hunting for amphibians there?


The Bullfrog is a large green or brownish-green frog with long, strong legs for jumping. This frog usually has dark spots on its back and...

Pacific Chorus Frog

The Pacific Chorus Frog is the only green or brown frog in our area with a dark “mask” across its eyes and “suction cups” on...

Western Spadefoot

The Western Spadefoot is small and squat.  Its back is olive-brown or gray with dark blotches and little red bumps.  The skin on its