Frogs typically live in forested and wetland areas and are found on every continent except for Antarctica. They live in ponds, within ground cover, in trees and sometimes in grasslands as well as deserts.
Like all amphibians, frogs begin their lives in water where they transform from tadpoles into adult frogs. Some frog species are specially adapted to live in trees, with one claw-like toe shaped especially for gripping branches and pads on their toes that aid in climbing. Other frog species spend their lives entirely in the water. Frogs who dwell in desert environments burrow into the ground during the dry season and go into a dormant state called estivation, then return to the surface during the rainy season.
Frogs living in colder climates hibernate during winter, burrowing into mud at the bottom of ponds or underneath the leaf litter on the forest floor. Some frog species in the coldest climates even freeze along with their environment and thaw again in the spring. This astounding adaptation is due to glucose production in the frog's body, which keeps ice from forming inside the cells and organs where it could cause damage. The frog stays alive, frozen solid in a state of suspended animation until it thaws again from the inside out in the spring.