Kangaroo are various marsupials from the Macropod (meaning "big foot") Family. They are the only large animal to use leaping as a means of locomotion. This is enabled by the large, elastic tendons in their hind-legs, in which they store energy. Due to their dry environment, Kangaroo must be capable of traveling great distances to forage. Like all marsupials, the newborn joey is born tiny and underdeveloped, yet it crawls across the mother's belly to her pouch. Here it will remain for around 235 days, leaving the pouch for the first time at 190 days, but returning regularly.