premise: The brush-tailed rock-wallaby or small-eared rock-wallaby ("Petrogale penicillata") is a kind of wallaby, one of several rock-wallabies in the genus "Petrogale".
hypothesis: The brush - tailed rock - small - eared rock - wallaby " Petrogale penicillata " is a kind of wallaby, one of several rock - wallabies in the genus " Petrogale ".