The taxonomy of this bird is still somewhat contentious.
Some describe as many as five distinct species; others consider some or all of these to be subspecies.
Some refer to the name Black-winged Stilt as the old world nominate species (Himantopus himantopus) and to the name Black-necked Stilt (Himantopus mexicanus) as the species occuring in the Americas.

1st, 2nd & 3rd photo: Bubali Bird Sanctuary, Aruba, 19 March 2006
4th photo: Bubali Bird Sanctuary, Aruba, 18 December 2006