Black Tern

Chlidonias niger

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Brief #

Dark head and short dark legs with a long slender bill.

Synonyms #

  • Gaviotín negro (Spanish)
  • Gaivina negra (Galician)

Red List Status #

The Black Tern is unlikely to become extinct in the near future.
Find out more about IUCN's Red List program here

Description #

They have short dark legs and a short, weak-looking black bill, measuring 27 mm (1.1 in), nearly as long as the head. The bill is long, slender, and looks slightly decurved. They have a dark grey back, with a white forewing, black head, neck (occasionally suffused with grey in the adult) and belly, black or blackish-brown cap (which unites in color with the ear coverts, forming an almost complete hood), and a light brownish-grey, 'square' tail. The face is white. There is a big dark triangular patch in front of the eye, and a broadish white collar in juveniles. There are greyish-brown smudges on the ides of the white breast, a downwards extension of the plumage of the upperparts. These marks vary in size and are not conspicuous. In non-breeding plumage, most of the black, apart from the cap, is replaced by grey. The plumage of the upperparts is drab, with pale feather-edgings. The rump is brownish-grey.

Measurements #

Length: 25 - 26 cm
Wingspan: 60 - 62 cm
Weight: 61 - 63 g