Mallard ducks are the most common and recognizable wild ducks in the Northern Hemisphere. The male mallard duck, called a drake, sports a glossy green head, a white ring around its neck and a rich, ...

Duck-billed platypuses are small, shy animals. They have a flattened head and body to help them glide through the water. Their fur, dark brown on top and tan on their bellies, is thick and repels ...