While it may look a little funny, there is actually a good reason the Flamingo eats with its head upside down. Flamingos are filter feeders. It uses its feet to stir up salty water then scoops a mouthful up. It then closes its mouth and uses its tongue to push the water through comb-like extensions that allow the water to leave while keeping the food. Because they need to bend upside down to scoop up the water, the Flamingo actually evolved to use its top part of the beak-like the bottom beak of most birds, meaning it can open and close the top while the bottom remains stationary.