Black-winged Stilt
Himantopus himantopus
Adults are 33–36 cm (13–14 in) long, with long, pink legs, and a long, rather thin black bill. The birds are generally black above and white below, with a white head and neck (with a varying amount of black, species-dependent). Males have a black back, often with a greenish gloss or sheen. Females' backs have a brownish hue, contrasting with the black remiges. In populations where the top of the head is normally white (at least in winter), females tend to have less black on the head and neck the entire year-round, while males often have much more black, particularly in summer.
ID text from Wikipedia, CC BY-SA 4.0
Pied Stilt
Himantopus leucocephalus
The pied stilt grows to a length of about 14 in (36 cm) with a wingspan of about 26.5 in (67 cm). The back of the head and neck, the back and the upper surfaces of the wings are glossy greenish-black. The undersides of the wings are plain black and the remainder of the plumage is white, apart from the tail feathers which are tinged with grey. The long, thin legs are pink and the toes have black claws. The long slender beak is black and the irises and the eyelids are red.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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