From The Collaborative International Dictionary of English v.0.48 :
Petrogale \Pe*trog"a*le\ (p[-e]*tr[o^]g"[.a]*l[=e]), n. [NL.,
fr. Gr. pe`tra a rock + galh^ a weasel.] (Zool.)
Any Australian kangaroo of the genus Petrogale, as the rock
wallaby ({Petrogale penicillata).
[1913 Webster]
From WordNet (r) 3.0 (2006) :
Petrogale
n 1: rock wallabies [syn: Petrogale, genus Petrogale]