Niha-Hial-Nas
From MicrasWiki

Common in the non-coastal regions of northern Corum, the Niha-Hial-Nas is a medium-sized, bipedal creature, which features protrusions on its back which resemble very hard rocks. Nocturnal in nature, this creature spends its days sleeping safely on its belly, with its legs tugged underneath it. To most casual observers, there is no visual difference between a sleeping Niha-Hial-Nas and any other of the boulders which dot the landscape.