[Mystery bird] Pelagic Cormorant, Phalacrocorax pelagicus, photographed at Haystack Rock, Cannon Beach, Oregon. It is taking nesting materials back to the rock, where many of these birds were busy nesting. [I will identify this bird for you in 48 hours]
Image: Terry Sohl, 8 June 2009 [larger view]
Photo taken with a Canon 50D, 400 5.6L lens.
Please name at least one field mark that supports your identification.