Few marine predators can reach theupper intertidal. Shore crabs occasionally eat periwinkles and limpets. From time totime predatory snails, such as unicornshells (
Acanthina
),
may venture into thesplash zone to do the same. On the otherhand, the upper intertidal is visited by predators from land. Birds, such as oyster-catchers (
Haematopus
), may eat largenumbers of limpets and snails. Raccoons,rats, and other land animals are alsoknown to enjoy these tasty molluscs, as dopeople in most of the world.