Among the small number of bird (e.g., ptarmigan) and mammal (e.g., muskox, arctic hare, arctic fox, musk ox) species that reside year-round on the tundra one commonly finds: Morphological adaptations large, compact bodies following Bergmann's and Allen's rules a thick insulating cover of feathers or fur pelage and plumage that turns white in winter, brown in summer Physiological adaptations ability to accumulate thick deposits of fat during the short growing season.
(arctic fox, musk ox) species; reside; year-round on the tundra one) (large, compact bodies; following; a thick insulating cover of feathers or fur pelage and plumage that turns white in winter, brown in summer Physiological adaptations ability) (fur pelage and plumage; turns; white; L:in winter)
arctic fox, musk ox) species large, compact bodies fur pelage and plumage
reside following turns
year-round on the tundra one
a thick insulating cover of feathers or fur pelage and plumage that turns white in winter, brown in summer Physiological adaptations ability
white L:in winter