Webster's English Dictionary

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kangaroo

kan.ga.roo \.kan-g*-'ru:\ n [prob. native name in Australia] : any of 
   various herbivorous leaping marsupial mammals (family Macropodida e) of 
   Australia, New Guinea, and adjacent islands with small head, large ears, 
   long powerful hind legs, a long thick tail used as a support and in 
   balancing, and rather small forelegs not used in progression