The red kangaroo is the world's largest marsupial. It can leap 25 feet and hop at speeds up to 35 miles per hour using its powerful hind legs and tail for balance. While newborn joeys are tiny, under an inch long, they develop in their mother's pouch, nursing and growing until big enough to hang out of and eventually stay out of the pouch. Red kangaroos travel together in large mobs and use hopping as their primary mode of transportation across the Australian grasslands, shrublands, and deserts where they consume vegetation and can go long periods without drinking.