tree kangaroo

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several arboreal macropods of the genus Dendrolagus of eastern Australia, New Guinea, and adjacent islands, having strong forelimbs, smaller hind limbs than most other kangaroos, and a very long tail, used for balance when climbing.

from The Century Dictionary.

• noun An arboreal kangaroo of the genus Dendrolagus. See cut under Dendrolagus.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of several Australian macropods, of the genus Dendrolagus, adapted for life in the trees

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun arboreal wallabies of New Guinea and northern Australia having hind and forelegs of similar length