Definition of "nail-tailed" [nail-tailed]

• Having a horny excrescence on the end of the tail: as, the nail-tailed kangaroo, Macropus unguifer.

The Century Dictionary (Public Domain)

• "Not that every Australian can tell you what a bettong or a tammar or even a nail-tailed wallaby is."
• "There are swamp wallabies, rock wallabies, brush wallabies, the nail-tailed wallaby with a naillike horny protuberance, of uncertain function, on its tail, and others."