Some fish use rocks as anvils
A wrasse can dig up a shellfish, carry it several meters to a rock, and repeatedly smash the shell against the rock with movements of its head. Once the shell breaks, the fish eats what is inside.
A wrasse can dig up a shellfish, carry it several meters to a rock, and repeatedly smash the shell against the rock with movements of its head. Once the shell breaks, the fish eats what is inside.