Wallaroo is a large marsupial of Australia closely related to kangaroos. Marsupials are animals that give birth to underdeveloped young, which the mother then carries in a pouch. Wallaroos have shorter and more thick-set bodies than do most kangaroos. Wallaroos are especially well adapted to life in mountains or rocky, hilly areas. There are several species (kinds) of wallaroo. The common wallaroo is sometimes called the euro. 
Wallaroos show variations in coat color and build by region. For example, wallaroos that live in the eastern highlands of Australia are dark brown in color and relatively stocky. Those that live farther west, in the inland drier regions and in coastal Western Australia, are reddish-brown and leaner. An isolated population of wallaroos on Barrow Island tends to grow much smaller.
Wallaroos are well adapted to dry conditions. They can survive without any regular source of drinking water. Wallaroos survive harsh conditions by staying in cool caves and under rock overhangs to avoid the heat of the desert in summer. A wallaroo’s body conserves the small amounts of water the animal gets in its food or drinks after the occasional rainstorm. Wallaroos are also able to survive on small quantities of poor-quality, low-protein vegetation.
