The young kangaroo, or joey, is born alive at a very immature stage when it is only about 2 cm long and weighs less than a gram. Immediately after birth it crawls up the mother’s body and enters the pouch. The baby attaches its mouth to one of four teats, which then enlarges to hold the young animal in place.
A polar bear’s head is oblong and relatively small compared to body size. The muzzle is elongated with a “Roman-nosed” (slightly arched) snout. Polar bears have 42 teeth, which they use for catching food and for aggressive behavior. Polar bears use their incisors to shear off pieces of blubber and flesh.