Sea Otter Eating Mussels

Moss Landing, CA: A sea otter lunches on mussels.  The mussels are small enough that the sea otter just bites into them without using any tools to open them first.  After eating a substantial number of mussels, the sea otter cleans itself by rolling in the water and rubbing its fur.  When the mussels are large, sea otters use tools such as rocks to open the mussels.  Sea otters also dine on crabs (and more crabs).