Sea otters use rocks to crack open clams, crabs and other shellfish on their tummies. They may also use rocks to hammer abalone shells, as quickly as 45 times in just 15 seconds, until the abalone loosen their tight grip on the seafloor. Many otters have a favorite rock that they store in one of their underarm pockets, carrying it with them wherever they go.

Butterflies can taste with their feet, using something called chemoreceptors that help them to identify plants. Females select the correct leaf on which to lay eggs by "drumming" it with her feet to release juices.