black-winged stilt
Specifically refers to the species Himantopus himantopus. In everyday contexts, セイタカシギ usually means this bird.
The black-winged stilt is characterized by its long red legs.
stilt; avocet
Broadly refers to any bird in the family Recurvirostridae, including stilts and avocets. In ornithological contexts, this broader sense may be used.
The family Recurvirostridae includes stilts and avocets.