A History of North American Birds, Land Birds. Volume 3. Robert Ridgway
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Название: A History of North American Birds, Land Birds. Volume 3

Автор: Robert Ridgway

Издательство: Public Domain

Жанр: Биология

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СКАЧАТЬ and jugulum, the two colors about equal; on the lower parts, the stripes grow narrower posteriorly, those on the abdomen and sides being in the form of narrow lines. The flanks, legs, anal region, and lower tail-coverts are always perfectly immaculate; the legs most deeply ochraceous, the lower tail-coverts nearly pure white. The rump has obsolete crescentic marks of brownish. The wings are variegated with the general dusky and ochraceous tints, but the markings are more irregular; the yellowish in form of indentations or confluent spots, approaching the shafts from the edge,—broadest on the outer webs. Secondaries crossed by about five bands of ochraceous, the last terminal; primary coverts plain blackish-brown, with one or two poorly defined transverse series of ochraceous spots on the basal portion. Primaries ochraceous on the basal two-thirds, the terminal portion clear dark brown, the tips (broadly) pale brownish-yellowish, this becoming obsolete on the longest; the dusky extends toward the bases, in three to five irregularly transverse series of quadrate spots on the outer webs, leaving, however, a large basal area of plain ochraceous,—this somewhat more whitish anteriorly. The ground-color of the tail is ochraceous,—this becoming whitish exteriorly and terminally,—crossed by five broad bands (about equalling the ochraceous, but becoming narrower toward outer feathers) of blackish-brown; on the middle feathers, the ochraceous spots enclose smaller, central transverse spots of blackish; the terminal ochraceous band is broadest.

      Eyebrows, lores, chin, and throat soiled white, the loral bristles with black shafts; face dingy ochraceous-white, feathers with darker shafts; eye broadly encircled with black. Post-orbital circle minutely speckled with pale ochraceous and blackish, except immediately behind the ear, where for about an inch it is uniform dusky.

      Lining of the wing immaculate delicate yellowish-white; terminal half of under primary coverts clear blackish-brown; under surface of primaries plain delicate ochraceous-white; ends, and one or two very broad anterior bands, dusky.

      ♂ (906, Carlisle, Penn.). Wing-formula, 2–1, 3. Wing, 11.80; tail, 5.80; culmen, .60; tarsus, 1.75; middle toe, 1.20.

      6888 ½ ½

      Otus brachyotus.

      6883 ⅓

      Otus brachyotus.

      ♀ (1,059, Dr. Elliot Coues’s collection, Washington, D. C.). Wing-formula, 2–3–1–4. Wing, 13.00; tail, 6.10; culmen, .65; tarsus, 1.80; middle toe, 1.20.

      Hab. Entire continent and adjacent islands of America; also Europe, Asia, Africa, Polynesia, and Sandwich Islands.

      Localities: Oaxaca (Scl. P. Z. S. 1859, 390); Cuba (Cab. Journ. III, 465; Gundl. Rept. 1865, 225, west end); Arizona (Coues, P. A. N. S. 1866, 50); Brazil (Pelz. Orn. Bras. I, 10); Buenos Ayres (Scl. & Salv. P. Z. S. 1868, 143); Chile (Philippi, Mus. S. I.).

      In view of the untangible nature of the differences between the American and European Short-eared Owls (seldom at all appreciable, and when appreciable not constant), we cannot admit a difference even of race between them. In fact, this species seems to be the only one of the Owls common to the two continents in which an American specimen cannot be distinguished from the European. The average plumage of the American representative is a shade or two darker than that of European examples; but the lightest specimens I have seen are several from the Yukon region in Alaska, and one from California (No. 6,888, Suisun Valley).

      Not only am I unable to appreciate any tangible differences between European and North American examples, but I fail to detect characters of the least importance whereby these may be distinguished from South American and Sandwich Island specimens (“galopagoensis, Gould,” and “sandwichensis, Blox.”). Only two specimens, among a great many from South America (Paraguay, Buenos Ayres, Brazil, etc.), are at all distinguishable from Northern American. These two (Nos. 13,887 and 13,883, Chile) are somewhat darker than others, but not so dark as No. 16,029, ♀, from Fort Crook, California. A specimen from the Sandwich Islands (No. 13,890) is nearly identical with these Chilean birds, the only observable difference consisting in a more blackish forehead, and in having just noticeable dark shaft-lines on the lower tail-coverts.

      Otus brachyotus.

      In the geographical variations of this species it is seen that the average plumage of North American specimens is just appreciably darker than that of European, while tropical specimens have a tendency to be still darker. I know of no bird so widely distributed which varies so little in the different parts of its habitat, unless it be the Cotyle riparia, which, however, is not found so far to the south. The difference, in this case, between the American and European birds, does not correspond at all to that between the two easily distinguished races of Otus vulgaris, Nyctale tengmalmi, Surnia ulula, and Syrnium cinereum.

      A specimen from Porto Rico (No. 39,643) is somewhat remarkable on account of the prevalence of the dusky of the upper parts, the unusually few and narrow stripes of the same on the lower parts, the roundish ochraceous spots on the wings, and in having the primaries barred to the base. Should all other specimens from the same region agree in these characters, they might form a diagnosable race. The plumage has an abnormal appearance, however, and I much doubt whether others like it will ever be taken.

      Habits. The Short-eared Owl appears to be distributed, in varying frequency, throughout North America, more abundant in the Arctic regions during the summer, and more frequently met with in the United States during the winter months. Richardson met with it throughout the fur countries as far to the north as the 67th parallel. Professor Holböll gives it as a bird of Greenland, and it was met with in considerable abundance by MacFarlane in the Anderson River district. Mr. Murray mentions a specimen received from the wooded district between Hudson’s Bay and Lake Winnipeg. Captain Blakiston met with it on the coast of Hudson’s Bay, and Mr. Bernard Ross on the Mackenzie River.

      Mr. Dresser speaks of it as common at times near San Antonio during the winter months, keeping itself in the tall weeds and grass. It is given by Dr. Gundlach as an occasional visitant of Cuba.

      Dr. Newberry met with it throughout Oregon and California, and found it especially common in the Klamath Basin. On the level meadow-like prairies of the Upper Pitt River it was seen associating with the Marsh Hawk in considerable numbers. It was generally concealed in the grass, and rose as the party approached. He afterwards met with this bird on the shores of Klamath Lake, and in the Des Chutes Basin, among grass and sage-bushes, in those localities associated with the Burrowing Owl (A. hypogæa). In Washington Territory it was found by Dr. Cooper on the great Spokane Plain, where, as elsewhere, it was commonly found in the long grass during the day. In fall and winter it appeared in large numbers on the low prairies of the coast, but was not gregarious. Though properly nocturnal, it was met with, hunting on cloudy days, flying low over the meadows, in the manner of the Marsh Hawk. He did not meet with it in summer in the Territory.

      Dr. Heermann found it abundant in the Suisun and Napa valleys of California, in equal numbers with the Strix pratincola. It sought shelter during the day on the ground among the reeds, and, when startled from its hiding-place, would fly but a few yards and alight again upon the ground. It did not seem wild or shy. He afterwards met with the same species on the desert between the Tejon Pass and the Mohave River, and again saw it on the banks of the latter. Richardson gives it as a summer visitant only in the fur countries, where it arrives as soon as the snow disappears, and departs again in September. A female was killed May 20 with eggs nearly ready for exclusion. The bird was by no means rare, and, as it frequently hunted for its prey in the daytime, was often seen. Its principal haunts appeared to be dense thickets of young pines, or dark and entangled willow-clumps, where it would sit on a low branch, watching assiduously for mice. When disturbed, it would fly low for a short distance, СКАЧАТЬ