koala

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

• noun An arboreal Australian marsupial (Phascolarctos cinereus) that has dense grayish fur, large ears, and sharp claws and feeds chiefly on the leaves of eucalyptus trees.

from The Century Dictionary.

• noun A marsupial mammal of Australia, Phascolarctos cinercus.

from the GNU version of the Collaborative International Dictionary of English.

• noun A tailless furry marsupial (Phascolarctos cinereus), found in Australia. The female carries her young on the back of her neck. Called also Australian bear, koala bear, native bear, and native sloth. The koala lives almost all of its life in trees, moves sluggishly like a sloth, and eats eucalyptus leaves almost exclusively.

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

• noun A tree-dwelling marsupial that resembles a small bear with a broad head, large ears and sharp claws, mainly found in eastern Australia.

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

• noun sluggish tailless Australian arboreal marsupial with grey furry ears and coat; feeds on eucalyptus leaves and bark