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]