Nicitating Membrane?

Posted by Sandy McRuer on August 12th, 2012

When looking at American Dippers I often saw the birds displaying what I thought was a white nictitating membrane. These are extra eyelids that many animals, including dippers have. Some are clear and some opaque. But to me this “membrane” looks pretty rough. After doing some research I realized that they actually have white eyelids. And this is what many observers mistake for nictitating membranes. When the eye is open the white feathers dissapear, or are only partly visible. The actual nictitating membrane is clear and only observable at close range.

Previous Articles

The Need for Local Bird Checklists

Posted by Sandy McRuer on May 15th, 2012

The Baillie Birdathon: It’s for the Birds!

Posted by Sandy McRuer on May 4th, 2012

Runner’s Trail

Posted by Sandy McRuer on May 1st, 2012

March, In Like a Lion, Out Like a Lamb

Posted by Sandy McRuer on March 4th, 2012

Big Leaf Maple Syrup

Posted by Sandy McRuer on February 16th, 2012

The Largest Tree in Canada

Posted by Sandy McRuer on June 24th, 2011

Oregon Ash around Port Alberni

Posted by Sandy McRuer on May 11th, 2011

Sandy Island (or Tree Island)

Posted by Sandy McRuer on May 3rd, 2011

Albinism and Leucism

Posted by Sandy McRuer on April 15th, 2011

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