The destruction or modification of the species habitats, or a change which prevents the frogs from moving from one habitat type to another, can eliminate a population. Habitat can also be damaged by the introduction of alien animals or plants. Found in wetland areas. The body is greyish or brownish-grey overall, with darker edged, circular blotches occuring down the back and sides. Adults measure between 51 and 76 cm.
Loss of habitat is another major cause of decline.
Found around the Arctic sea ice and across the Polar Basin. They are more elongated and streamlined for their aquatic life in comparison to land-dwelling bears. An extra layer of fat beneath the skin provides further insulation from the cold. All polar bears are white, providing camouflage when hunting. They are the largest bears with average weights for females of about 250 kg, and for males about 350 kg.