A Great Blue Heron in my neighbors' field. It has its nictitating membrane closed. This is a "third eyelid" or clear eyelid that it can close to protect the eye while hunting (1/14/2017)
EF100-400mm f/4.5-5.6L IS II USM +1.4x III @ 560mm f8 1/500s ISO400
A Great Blue Heron in my neighbors' field. It has its nictitating membrane closed. This is a third eyelid or clear eyelid that it can close to protect the eye while hunting 1142017EF100400mm f4.55.6L IS II USM 1.4x III 560mm f8 1500s ISO400Shingle SpringsCA20170114 January 142017
