Saturday, June 25, 2011

Going In

Here is a close-up of a Great Blue Heron as it attempts to spear a fish.  It is notable because the nictating membrane is clearly visable.  The nictitating membrane is a transparent third eyelid which is present in some animals that can be drawn across the eye for protection while maintaining visibility.  It moves in a horizontal direction.  Tomorrow, I'll show the entire photo.

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