Figure 1
From: Wild sea otter mussel pounding leaves archaeological traces

Wild sea otters at Bennett Slough Culverts opening mussels using stones. The otters are using (A) a chest anvil, and (B) an emergent anvil.
From: Wild sea otter mussel pounding leaves archaeological traces

Wild sea otters at Bennett Slough Culverts opening mussels using stones. The otters are using (A) a chest anvil, and (B) an emergent anvil.