A Bear's Bare Necessity: Rock for Scratching...
Image: Volker Deecke Just... ...ed a brown bear in shallow water. The animal picked up a small, barnacle-covered rock, turned... .... It repeated this with another rock ( Animal Cognition, DOI: 10.1007/s10071-012-04...
http://www.neatorama.com/2012/03/05/a-bears-bare-necessity-rock-for-scratching/
