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Encyclopedia Britannica

SKUA

This article appears in Volume V25, Page 196 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: SIV-SOU

SKUA ,' the name for. a long` while given to certain of the Laridae (see Gunn), birds which sufficiently differ in structure, appearance and habits to justify their separation as a distinct genus, Stercorarius (Lestris of some writers), or even subfamily, Stercorariinae. Swift of flight, powerfully armed, but, above all endowed with extraordinary courage, they pursue their weaker cousins, making the latter disgorge their already swallowed prey, which is nimbly caught before it reaches the water; and this habit, often observed by sailors and fishermen, has made these predatory, parasitic birds locally known as "Teasers," "Boatswains," ; 2 and, from a misconception of their
1 Thus written by Hoier (circa 1604) as that of a Faeroese bird (hodie Skuir) an example of which he sent to Clusius (Exotic. Auctarium, p. 367). The word being thence copied by

Willughby

WILLUGHBY, FRANCIS (1635—1672)

has been generally adopted by English authors, and applied by them to all the congeners of the species to which it was originally peculiar.
2 This name in

seamen

SEAMEN, LAWS RELATING TO

's ornithology applies to several other kinds of birds, and, though perhaps first given to those of this group, is nowadays most commonly used for the species of TROPIC-BIRD (q.v.), the projecting middle feathers of the tail in each kind being
resort to breed, they seek food of their own taking, whether small mammals, little birds, insects or berries; but even here their uncommon courage is exhibited, and they will defend their homes and offspring with the utmost spirit against any intruder; repeatedly

shooting

SHOOTING

down on man or dog that invades their haunts, while every bird almost, from an eagle down-wards, is repelled by buffets or something worse.
The largest species known is the .Stercorarius catarrhactes of ornithologiststhe " Skooi " or " Bonxie " of the Shetlanders, a bird in size equalling a herring-

gull

, Larus argentatus. The sexes do not differ appreciably in, colour, which is of a dark brown, somewhat lighter beneath ; but the primaries have at the base a patch of white, visible even when the wings are closed, and forming, when they are spread, a conspicuous band. The bill and feet are black. This is a species of comparatively limited range, breeding only in some two or three localities in the Shetlands, about half a dozen in the Faeroes,' and hardly more in Iceland. Out of the breeding-season it shows itself in most parts of the North Atlantic, but never seems to stray farther south than Gibraltar or Morocco, and it is therefore a matter of much

interest

INTEREST

to find the Southern Ocean inhabited by a birdthe " Port Egmont Hen " of Cook's Voyageswhich so closely resembles the Skua as to have been for a long while regarded as specifically identical with it, but is now usually recognized as distinct under the name of S. antarcticus. This bird, characterized by its stout deep bill and want of rufous tint on its lower plumage, has an extensive range, and would seem to exhibit a tendency to further differentiation, since Howard Saunders, in a monograph of the group (Prot. Zool. Society, 1876, pp. 317-332), says that it presents three local formsone occurring from New Zealand to Norfolk Island and past Kerguelen Land to the Cape of Good Hope, another restricted to the Falklands, and the third hitherto only met with near the south-polar ice. On the western coast of South America, making its way into the Straits of Magellan, and passing along the coast so far as Rio Janeiro, is found S. chilensis, distinguished among other characters by the cinnamon tint of its lower plumage. Three other smaller species of the genus are known, and each is more widely distributed than those just mentioned, but the home of all is in the more northern parts of the earth, though in winter two of them go very far south, and, crossing the

equator

EQUATOR (
Late
- LATE
Lat. aequator, from aequare, to make equal)

, show themselves on the seas that

wash

WASH, THE

the Cape of Good Hope, Australia, New Zealand and Peru. The first of them is S. pomatorhinus (often incorrectly spelt pomarinus), about the size of a common

gull

, Lanus Gnus, and presenting, irrespective of sex, two very distinct phases of plumage, one almost wholly sooty-brown, the other particoloured--dark above and white on the breast, the sides of the neck being of a glossy straw-colour, and the lower part of the neck and the sides of the

body

BODY

barred with brown; but a singular feature in the adults of this species is that the two median tail-feathers, which are elongated, have their shaft twisted towards the tip, so that in flight the lower surfaces of their webs are pressed together vertically, giving the bird the appearance of having a disk attached to its tall. The second and third species so closely resemble each other, except in size, that their distinctness was for many years unperceived, and in consequence their nomenclature is an almost bewildering puzzle. H. Saunders (loc. cit.) thinks that the larger of them, which is about the size of a black-headed gull, should stand as S. crepidatus, and the smaller as S. parasiticus, though the latter name has been generally used for the larger when that is not termed, as it often is, S. richardsoni, a name that correctly applies only to whole-coloured examples, for this species too is dimorphic. Even its proper English name 4 is disputable, but it has been frequently called the Arctic gull or Arctic skua, and it is by far the commonest of the genus in Britain, and perhaps throughout the northern hemisphere. It breeds abundantly on many of the Scottish islands, and in most countries lying to the northward. The nest is generally in long heather, and contains two eggs of a dark olive-colour, suffused with still darker brown pitches. Birds of either phase of plumage pair indiscriminately, and the young show by their earliest feathers whether they will prove whole or parti-coloured; but in their immature plumage the upper surface is barred with pale reddish brown. The smallest species, commonly known in English as the long-tailed or Buffon's
generally likened to the marlinespike that is identified with the boatswain's position; but perhaps the authoritative character assumed by both bird and officer originally suggested the name.
' It has long been subjected to persecution in these islands, a reward being paid for its head. On the other hand, in the Shetlands a fine was exacted for its death, as it was believed to protect the sheep against eagles. Yet for all this it would long ago have been extirpated there, and have ceased to be a British bird in all but name, but for the

special

SPECIAL

protection afforded it by several members of two families (Edmonston and Scott of Melby), long before it was protected by modern legislation.
' It is the " Fasgadair " of the Hebrides, the " Shooi " of the Shetlands, and the " Scouti-allen " of the fishermen on the east coast of Scotland.
196
skua, is not known to exhibit the remarkable dimorphism to which the two preceding are subject. It breeds abundantly in some seasons on the fells of Lapland, its appearance depending chiefly on the presence of lemmings (Lemmus norvegicus), on which it mainly preys. All these three species occasionally visit the southern coasts of Europe in large flocks, but their visitations are highly irregular.
(A. N.)

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JCSM is a 501(c)(3), non-profit organization. Copyright © 1997-present.