Bird Beaks and Feet - The Biology Corner A bird's beak and feet can tell us much about their habitat and lifestyle. Most birds are even classified according to structural similarities between their beaks and feet. In this excercise, you will look at pictures of birds and make inferences about their lifestyles.Bird Skeleton · Amniote Egg[PDF] Beaks and Feet - The Tennessee Ornithological Society Beaks and Feet A bird’s beak or bill has the primary function of gathering and eating food. A bird’s beak is designed to help it eat the foods it needs including tearing, crushing, picking, probing and breaking the shells of food items. Birds also use their beaks to preen or clean and oil their feathers.