[Mystery bird] A young-of-the-year Cave Swallow, Petrochelidon fulva, photographed at Chambers County, Texas. [I will identify this bird for you in 48 hours]
Image: Joseph Kennedy, 26 June 2010 [larger view].
Nikon D200, Kowa 883 telescope with TSN-PZ camera eyepiece 1/500s f/8.0 at 1000.0mm iso400.
Please name at least one field mark that supports your identification.
This mystery bird species is extremely local and seasonal in the southernmost portion of the USA, nesting in very limited numbers only in southern Texas and New Mexico.