If it walks like a duck (or a goose or a swan), it can find food in mud without seeing or smelling it. These waterfowl bills are covered in skin that’s a lot like the sensitive skin on the palms of our hands, and it can feel food in mud and murky water. Slav Bagriantsev, Eve Schneider, and Evan Anderson at Yale University are researching duck skin to learn more about how our sense of touch works.