Chlidonias 27 May 2022 Female in the foreground, with the long curved bill; and the male in the back with the shorter and straighter bill. This species had the most pronounced sexual dimorphism in bill shape of any known bird.
Female in the foreground, with the long curved bill; and the male in the back with the shorter and straighter bill. This species had the most pronounced sexual dimorphism in bill shape of any known bird.
