West African Crested Tern

The West African crested tern (Thalasseus albididorsalis) is a bird species in the family Laridae. Until 2020 it was considered a subspecies of the New World royal tern, Thalasseus maximus. == Taxonomy and systematics == The West African crested tern was long thought to be a subspecies of royal tern. A study published in 2005 showed that it is more closely related to the lesser crested tern (Thalasseus bengalensis), and a 2017 publication confirmed and expanded on those results. The International Ornithologists' Union accepted it as a full species on the publication of version 10.1 in January 2020, and the American Ornithological Society followed suit on 30 June 2020. == Description == The West African crested tern is one of the three larger crested terns, along with royal tern and greater crested tern. Its tail is shallowly forked and the adult's bill is long and orange. It is about 50 cm (20 in) long, with a wingspan between 125–135 cm (49–53 in), and weighs 320–440 g (11–16 oz) with a mean weight of 367 g (12.9 oz). In breeding plumage its underside is white and upper parts silvery grey; the top of the head is black with a shaggy crest…