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After moulting, the young terns resemble the adult, but still have a variegated wing pattern with a dark bar on the inner flight feathers. [12] The northern subspecies T. b. velox and T. b. thalassina are in breeding plumage from May to September or October, whereas the relevant period for the two southern African races is from December to April.
It is a medium-large tern 38–43 cm long, closely related to Sandwich tern T. sandvicensis, Cabot's tern T. acuflavidus, and lesser crested tern T. bengalensis.It is most similar to the former, differing in the bill pattern, which is the reverse of the Sandwich tern's, being yellow with a black tip; the bill is also stouter, like Cabot's.
Terns are normally free of blood parasites, unlike gulls that often carry Haemoproteus species. An exception is the brown noddy, which sometimes harbours protozoa of that genus. [ 73 ] In 1961 the common tern was the first wild bird species identified as being infected with avian influenza, the H5N3 variant being found in an outbreak involving ...
The white tern or common white tern (Gygis alba) is a small seabird found across the tropical oceans of the world. [2] It is sometimes known as the fairy tern, although this name is potentially confusing as it is also the common name of Sternula nereis.
Pigeon houses are also sometimes referred to as "coops" although the word seems to have originally applied to the breeding pens inside the housing. They are also referred to as pigeon duckets in North East England. [13] There are as many different kinds of enclosures used to house pigeons in as there are pigeon fanciers.
This is an alphabetical list of pigeon breeds; these are exclusively breeds of the domestic pigeon (Columba livia domestica). Other Columbidae species (e.g., the Barbary dove , Streptopelia risoria ) have been domesticated and developed into breeds, but these are generally simple colour variations of the plumage .
Columbidae is a bird family consisting of doves and pigeons.It is the only family in the order Columbiformes.These are stout-bodied birds with short necks and short slender bills that in some species feature fleshy ceres.
Feral pigeons (Columba livia domestica or Columba livia forma urbana), also called city doves, city pigeons, or street pigeons, [1] [2] are descendants of domestic pigeons (Columba livia domestica) that have returned to the wild. [3] The domestic pigeon was originally bred from the wild rock dove, which naturally inhabits sea-cliffs and ...