How Do Birds Protect Their Eyes When They Fly In the Rain and What Is a Nictitating Membrane?
Birds have a sort of thin extra eyelid called a nictitating membrane that protects their eyes and may do so in the rain. The membrane is not entirely transparent, so the birds may not see clearly, but they can probably see light and dark. As in cats, dogs and other animals, this membrane can flick over the eye very quickly to pr
