Question: Wallaroo is any of three closely related species of moderately large macropod, intermediate in size between the kangaroos and the wallabies, the  word "wallaroo" is from which Australian Aboriginal language of the Yuin–Kuric group that is spoken in the region of Sydney, New South Wales, "walaru"?
Sentence (from "Wallaroo"): In general, a large, slim-bodied macropod of the open plains is called a "kangaroo"; a small to medium-sized one, particularly if it is relatively thick-set, is a "wallaby": most wallaroos are only a little smaller than a kangaroo, fairly thickset, and are found in open country.
Relevant evidence: No