Seventeen subspecies of the American Kestrel are recognized, generally based upon plumage, size, and vocalizations. 
This is Falco sparverius peruvianus which is found in South West Ecuador, Peru and North Chile.

1st photo: Cuzco, Peru, 4 june 2009
2nd & 3rd photo: Cuzco, Peru, 30 June 2009
4th & 5th photo: Cuzco, Peru, 8 june 2009