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Published on Mar 19, 2012
RRP camera person providing close-ups & panning. Tree branches are rapidly developing foliage. Many small birds are sharing this cottonwood with the Decorah pair. Mom looks tired; check-out her lower-eyelid (at 8min 10sec). Eagles have eyelids that close during sleep. For blinking, they also have an inner eyelid called a nictitating membrane. Every three or four seconds, the nictitating membrane slides across the eye from front to back, wiping dirt and dust from the cornea. Because the membrane is translucent, the eagle can see even while it is over the eye. Unlike the upper and lower eyelids, the nictitating membrane moves horizontally across the eyeball.