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In page Wallaby:

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Wallabies are not a distinct genetic group. Nevertheless, they fall into several broad categories.[citation needed] Brush wallabies of the genus Notamacropus, like the agile wallaby (Notamacropus agilis) and the red-necked wallaby (Notamacropus rufogriseus), are most closely related to the kangaroos and wallaroos and, aside from their size, look very similar. These are the ones most frequently seen, particularly in the southern states.[citation needed]