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Broad-winged hawk
A broad-winged hawk blinks, displaying its nictitating membrane - a translucent third eyelid found in some birds, reptiles and sharks. This membrane helps moisten and protect the eye while maintaining vision.
Photo by Courtney Celley/USFWS. Original public domain image from Flickr
Broad-winged hawk
A broad-winged hawk blinks, displaying its nictitating membrane - a translucent third eyelid found in some birds, reptiles and sharks. This membrane helps moisten and protect the eye while maintaining vision.
Photo by Courtney Celley/USFWS. Original public domain image from Flickr
Public DomainFree CCO U.S. Government image for Personal and Business use