White-tailed Kites are easy to spot; especially when "hover hunting". When hunting they will hover high (100') above game that interests them. If your are lucky you'll see them stoop down for it. Their diet is exclusively rodents (Clark and Wheeler)..
Adults have light grey underwings and underparts and distinctive black carpal patches. The tail is white. Immatures are similar with a buffy color to the back, a buffy wash on the breast, and a dusky subterminal band on the tail.
Look for the White-tailed Kite in open areas on the coastal plain. They will perch in small trees and on wires. I don't ever recall seeing them on telephone pole or fence posts. They seem to hunt over fallow rice fields alot. I think White-tailed Kite is a breeder on most of the coastal refuges on the the UTC. look for it in Anahuac NWR, Brazoria NWR, and San Bernard NWR. Their pretty common around High Island.
A breeding range map is available form the Breeding Bird Survey
A winter range map is available from the Christmas Bird Count