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Fabulous capture Terry. Wonderful detail and iridescent plumage colouring. Great action as he bludgeons the fish. I think the membrane across the eye is also called the third eyelid and also the nictitating membrane - looked it up:- "Birds have special muscle and tendon arrangement whereby they can actively draw the nictitating membrane across the globe (from medial to lateral) . This action serves to distribute tears across the cornea and is important to anterior segment health similar to eyelid blinking in mammals."
Sylvia
Sylvia

Lovely shot and great discription from Sylvia - I've seen it before in other Kingfishers and I think they also do it to protect their eye's when smashing the prey - the raptors use the membrane to protect their eye from direct sunlight - I've got a shot of the Black shouldered Kite using the membrane to that effect - Ina