This juvenile western-type "anatum" Peregrine
Falco peregrinus anatum was on Mustang
Island, Nueces county, Texas on October 28, 2013. Initally thought
to be a juvenile Aplomado Falcon, closer looks plus viewing of my
photos revealed it to be a Peregrine, presumeably of this type. Note
that the cinnamon-buff vent and undertail coverts were more
contrasting than evident in these photos - taken in dimming evening
light:
Sadly the tail is not visible in the perched images, but it looked
very long - more Aplomado-like. The flight pics show the long tail
and resemblance to Aplomado Falcon:-