a squirrel hammering is black
black_squirrel is tree_squirrel. hammering is not hitting. grey_squirrel is squirrel. african_striped_squirrel is squirrel. long_clawed_ground_squirrel is not squirrel. black_squirrel is not tree_squirrel. long_clawed_ground_squirrel is squirrel. grey_squirrel is not squirrel. nailing is not pounding. hammering is hitting.