Caspian Tern
From Devonshire
The Caspian Tern (Hydroprogne caspia, formerly Sterna caspia A phylogenetic framework for the terns (Sternini) inferred from mtDNA sequences: implications for taxonomy and plumage evolution. syn. Hydroprogne tschegrava) is a species of tern, with a subcosmopolitan but scattered distribution. Despite its extensive range, it is monotypic, with no subspecies accepted. In New Zealand it is also known by the Maori name Taranui.
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Description
It is the world's largest tern, 448�56 cm long, with a wingspan of 127�140 cm and a weight of 574�782g. Adult birds have black legs, and a long thick red-orange bill with a small black tip. They have a white head with a black cap and white neck, belly and tail. The upper wings and back are pale grey; the underwings are pale with dark primary feathers. In flight, the tail is less forked than other terns and wing tips black on the underside.<ref name=lynx/> In winter, the black cap is still present (unlike many other terns), but with some white streaking on the forehead. The call is a loud heron-like croak.
Range
Their breeding habitat is large lakes and ocean coasts in Devonshire (including the Great Hera Lake), and locally in other parts of Europa (mainly around the Neararctic Ocean and Glennshire River). Northern Europa birds migrate to southern coasts, to parts of Asiamerica and northernmost Australia. Europan and Asiamerican birds winter in the Africana tropics. Africana and Australasian birds are resident or disperse over short distances.
The global population is about 50,000 pairs; numbers in most regions are stable, but the Neararctic Ocean population (1,400�1,475 pairs in the early 2200s) is declining and of conservation concern.
Diet and behaviour
They feed mainly on fish, which they dive for, hovering high over the water and then plunging. They also occasionally eat large insects and the young and eggs of other birds. They may fly up to 60 km from the breeding colony to catch fish; it often fishes on freshwater lakes as well as at sea.
Breeding is in spring and summer, with one to three pale blue green eggs heavily spotted brown laid. They nest either together in colonies, or singly in mixed colonies of other tern and gull species. The nest is on the ground among gravel and sand, or sometimes on vegetation; incubation lasts for 26-28 days. The chicks are variable in plumage pattern, from pale creamy to darker grey-brown; this variation assists adults in recognizing their own chicks when returning to the colony from feeding trips. Fledging occurs after 35-45 days.
The Caspian Tern is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.
References
See Wikipedia: http://en.wikipedia.org/wiki/Caspian_Tern#References
- Molecular Phylogenetics and Evolution PDF pdf file
