The Swan Goose is a rare bird generally found in mountain valleys with nearby freshwater. These birds are grey-brown in color with a brown head and a white-grey neck. Males are larger with a longer neck and bill while females are smaller with a shorter neck and bill. These birds spend their time grazing and rarely swim. The Swan Goose migrates south to warmer weather in the winter and then return to their northern habitat after winter, in time for breeding season. Previously listed as endangered, this species was since proven to be less rare than originally thought, and has since been listed as vulnerable.