[Mystery birds] American White Pelican, sometimes known as the Rough-billed Pelican due to the structure that develops on the upper mandible of breeding adults, Pelecanus erythrorhynchos, photographed at Smith Point, Texas. Numerous Broad-winged hawks, Buteo platypterus (background) with two red-tailed hawks, Buteo jamaicensis (right of center, lower left) [I will identify these birds for you in 48 hours -- If you can convince me there's other species in this image, feel free to add your comments and supporting arguments]
Image: Joseph Kennedy, 26 September 2009 [larger view].
Nikon D200, Kowa 883 telescope with TSN-PZ camera eyepiece 1/1250s f/8.0 at 1000.0mm iso400.
Please name at least one field mark that supports your identification.
Can you name ALL the species in this image?