Forster's tern

Forster's tern
Breeding plumage, at Horicon Marsh in Wisconsin
Nonbreeding plumage, at Bolsa Chica in California
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Charadriiformes
Family: Laridae
Genus: Sterna
Species:
S. forsteri
Binomial name
Sterna forsteri
Nuttall, 1834
  Breeding
  Migration
  Year-round
  Non-breeding

Forster's tern (Sterna forsteri) is a tern in the family Laridae. The genus name Sterna is derived from Old English "stearn", "tern",[2] and forsteri commemorates the naturalist Johann Reinhold Forster.[3]

It breeds inland in North America in the northern United States and southern Canada, and migrates south to winter in the southern United States, Mexico, the Caribbean, and northern Central America. It is also a rare but annual vagrant in western Europe, and has wintered in Ireland and Great Britain on a number of occasions.

This species breeds in colonies in marshes. It nests in a ground scrape and lays two or more eggs. Like all white terns, it is fiercely defensive of its nest and young.

The Forster's tern feeds by plunge-diving for fish, but will also hawk for insects in its breeding marshes. It usually feeds from saline environments in winter, like most Sterna terns. It usually dives directly, and not from the "stepped-hover" favored by the Arctic tern. The offering of fish by the male to the female is part of the courtship display.

This is a medium-small tern, 33–36 cm (13–14 in) long with a 64–70 cm (25–28 in) wingspan and a weight ranging from 130 to 190 g (4.6-6.7 oz ).[4] It is most similar to the common tern, with pale gray upperparts and white underparts. Its legs are red and its bill is red, tipped with black. In winter, the forehead becomes white and a characteristic black eye mask remains. Juvenile Forster's terns are similar to the winter adult. The call is similar to that of common terns, but also some harsher sounds suggestive of a small gull like Bonaparte's gull.

This species is unlikely to be confused with the common tern in winter because of the black eye mask, but is much more similar in breeding plumage. Forster's has a gray center to its white tail, and the upperwings are whiter, without the darker primary wedge of the common tern.

  1. ^ BirdLife International (2018). "Sterna forsteri". IUCN Red List of Threatened Species. 2018: e.T22694646A132564836. doi:10.2305/IUCN.UK.2018-2.RLTS.T22694646A132564836.en. Retrieved 12 November 2021.
  2. ^ "Sterna". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  3. ^ Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 163. ISBN 978-1-4081-2501-4.
  4. ^ "Forster's Tern Identification, All About Birds, Cornell Lab of Ornithology". www.allaboutbirds.org. Retrieved 25 September 2020.