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The western capercaillie (Tetrao urogallus), also known as the Eurasian capercaillie, wood grouse, heather cock, cock-of-the-woods, or simply capercaillie / ˌ k æ p ər ˈ k eɪ l (j) i /, [3] is a heavy member of the grouse family and the largest of all extant grouse species. The heaviest-known specimen, recorded in captivity, had a weight ...
The Feekes scale is a system to identify the growth and development of cereal crops introduced by the Dutch agronomists Willem Feekes (1907-1979) in 1941. [ 1 ] [ 2 ] This scale is more widely used in the United States [ 3 ] than other similar and more descriptive [ 4 ] [ 5 ] scales such as the Zadoks scale or the BBCH scale .
Compared to the western capercaillie, it is slightly smaller in size with a slimmer body profile and longer neck, has a black beak (hence its name) instead of being horn-colored, and a longer, more spatulate tail. The eastern capercaillie has a somewhat glossy bluish-black head and neck down to a metallic turquoise breast.
The genus Tetrao was introduced in 1758 by the Swedish naturalist Carl Linnaeus in the tenth edition of his Systema Naturae. [1] The genus name is the Latin word for a game bird, probably a black grouse. [2]
The capercaillie is a large grouse, 80 to 115 cm (31 to 45 in) in length, with the female much smaller than the male. It has dark grey plumage with fine blackish vermiculation (wavelike pattern) around the head and neck. The breast is glossy greenish-black. It has a long, rounded tail, an ivory-white bill, and a scarlet crest. [1]
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In biology, an identification key, taxonomic key, or frequently just key, is a printed or computer-aided device that aids in the identification of biological organisms. Historically, the most common type of identification key is the dichotomous key , a type of single-access key which offers a fixed sequence of identification steps, each with ...
Handbooks for the Identification of British Insects is a series of books produced by the Royal Entomological Society (RES). The aim of the Handbooks is to provide illustrated identification keys to the insects of Britain, together with concise morphological, biological and distributional information.