Seventeen subspecies of the American Kestrel are recognized, generally based upon plumage, size, and vocalizations.
This is Falco sparverius brevipennis which is found in Aruba, Curaçao and Bonaire.

1st photo: A male eating a lizard. Arashi Beach area, Aruba, 27 March 2006
2nd photo: A male. Arikok National Park, Aruba, 20 December 2006
3rd photo: A female. Arashi Beach area, Aruba, 27 March 2006
4th photo: A juvenile in its nest in a cactus. Arashi Beach area, Aruba, 27 March 2006