Barnacles are arthropods. Free-floating youth secrete a powerful adhesive to attach themselves to objects head-first. They extend their feet from their case an

Barnacles are arthropods. Free-floating youth secrete a powerful adhesive to attach themselves to objects head-first. They extend their feet from their case and use them to filter food from the water then pass it towards their mouth. They attach themselves to many different things: rocks, shells, plants, whales and yes turtles.