Hi Enrique- I've checked the Handbook of the Birds of the World and the location and field marks shown in the image suggest a White-tailed Kite, Elanus leucurus. Note the whitish head, overall light colouration, red eye, yellow cere, longish tail. There is no other Elanus kite with a Central American distribution.
Last edited by John Chardine; 06-25-2011 at 08:54 PM.