Flamingos can only eat upside-down.
A flamingo's whole body is designed to aid in upside-down eating. Its feet kick up food from the bottom of lakes and estuaries, its tongue pumps food-filled water in and out as part of a filtering process, and its lower bill is much larger, while the upper bill is not fixed—the opposite of other birds—which means it’s perfect for upside-down eating.
Flamingos largely eat mollusks, insects and their larvae, and small crustaceans, as well as aquatic vegetation. In fact, the flamingo’s pink color comes from aqueous bacteria and beta-carotene they get from their food. Baby flamingos hatch with white feathers that turn gray, only becoming pink as they grow older.
Image: Jeremy Woodhouse/Blend Images/Corbis