Long-eared Owl -nictitating membrane

Owls have three eyelids, an upper, lower and third, nictitating membrane that cleans and protects the eye. As someone who studies birds, I relish the opportunities to learn and see more about how they live in the wild. This is the first time I captured the actual nictating membrane in action. The photo might not fall into the cute, beautiful or OMG categories but to me, it provides an unusual study of this complex and intelligent hunter.
Shoot Date: February 25, 2017
Canon EOS 5D Mark III
Aperture priority ¹⁄₅₀₀ sec at f/8.0 0 EV
Lens: TAMRON SP 150-600mm F/5-6.3 Di VC USD A011 @ 600 mm
ISO: 2500
Long-eared Owl -nictitating membrane