Allan Brooks.
No. 25.
AMERICAN CROSSBILL.
A. O. U. No. 521. Loxia curvirostra minor (Brehm.).
Synonym.—Red Crossbill.
Description.—Adult male: Tips of mandibles crossed either way; plumage red, brightest on rump; feathers of back with brownish centers; wings and tail fuscous. Shade of red very variable,—orange, cinnabar, even vermilion, sometimes toned down by a saffron suffusion. Immature males sometimes present a curiously mottled appearance with chrome-green and red intermingled. Female and young: Dull olive-green, brighter and more yellow on head and rump; below gray overcast by dingy yellow. Adult male, length 5.50-6.25 (139.7-158.8); wings 3.40 (86.4); tail 2.05 (52.1); bill .70 (17.8) or under.
Recognition Marks.—Sparrow size; crossed mandibles; male red and female olive-green; both without white wing-bars.
“Nest: in forks or among twigs of tree, founded on a mass of twigs and bark-strips, the inside felted of finer materials, including small twigs, rootlets, grasses, hair, feathers, etc. Eggs: 3-4, 0.75 × 0.57, pale greenish, spotted and dotted about larger end with dark purplish brown, with lavender shell-markings” (Coues). Av. size, .85 × .53 (21.6 × 13.5) (Brewer). Season: erratic, Feb.-Oct.; one brood.
General Range.—Northern North America, resident sparingly south in the eastern United States to Maryland and Tennessee, and in the Alleghanies, irregularly abundant in winter. Of irregular distribution thruout the coniferous forests of the West, save in southern California, Arizona, and New Mexico, where replaced by L. c. stricklandi.
Range in Washington.—Found thruout the coniferous forests of the State; of irregular occurrence locally. Non-migratory but nomadic.
Authorities.—Curvirostra americana Wils. Baird, Rep. Pac. R. R. Surv. IX. pt. II. 1858, 426 part, 427. T. C&S. L¹. D¹. Ra. D². J. B. E.
Specimens.—U. of W. Prov. E. B.
When a bird’s pastures are the tree-tops it is possible for it to live a quite secluded life here in Washington. And, indeed, we know the Crossbill chiefly as a wandering voice or, rather, a vocal babel, passing from summit to summit in the grim fir forest. But on a rare day, it may be in Spokane, or it may be in Tacoma, the birds descend to human levels and are discovered feeding busily on their favorite pine cones. The birds are perfectly indifferent to equilibrium, and feed any side up without care. While thus engaged they may exhibit little fear of the beholder and sometimes venture within reach; but as often, for some whimsical reason they are up and away again as tho seized by evil spirits.
The Crossbill owes its peculiar mandibles to an age-long hankering for pine-seeds (using that word in the generic sense), a desire fully satisfied according to the fashion of that Providence which works so variously thru Nature, and whose method we are pleased to call evolution. The bill of the bird was not meant for an organ of prehension, and Buffon, the Deist, once won a cheap applause by railing at the Almighty for a supposed oversight in this direction; but as matter of fact, its wonderful crossed mandibles enable the Crossbill to do what no other bird can; viz., pry and cut open the scales of a fir cone, in order to extract the tiny seed with its tongue.
These birds are not entirely confined to a vegetable diet, for I once detected a group of them feeding industriously in a small elm tree which was infested with little gray insects, plant-lice or something of the sort. The presence of these insects, in colonies, caused the edges of the leaves to shrivel and curl tightly backward into a protective roll. Close attention showed that the Crossbills were feeding exclusively upon these aphides. They first slit open a leaf-roll with their scissor-bills, then extracted the insects with their tongues, taking care apparently to secure most of the members of each colony before passing to the next.
Crossbills also feed to some extent upon the ground, where they pick up fallen seeds and other tidbits. Mr. J. F. Galbraith, a ranger of the Washington Forest Reserve, first called my attention to another purpose which the birds have in visiting the ground. He had noticed how at certain places, and notably where dish-water was habitually thrown, the Crossbills were wont to congregate, and, turning the head sidewise, to thrust out the tongue along the bare ground in a most puzzling manner. Suspecting at last the real state of affairs, he sprinkled the ground with salt, and upon their return the birds licked it up with great avidity. Mr. Galbraith claims to have tried this experiment successfully upon numerous occasions. The birds do not appear to recognize the salt at first sight, but soon learn to resort to established salt-licks in open places. Rev. Fred M. McCreary also reports similar habits in connection with certain mineral springs in the Suiattle country. When we recall that the normal food of the Crossbill is pine-seeds, this craving for Nature’s solvent is readily understandable.
Crossbills give out an intermittent rattling cry, or excited titter, tew, tew, tew, while feeding. They have also a flight note which consists of a short, clear whistle; and a flock composed of separately undulating individuals affords a pleasing sensation to both eye and ear, as it rapidly passes. The male is said to have sprightly whistling notes of a most agreeable character, generically related to that of the Pine Grosbeak, or Purple Finch, but their exhibition must be rather rare.
After all, there is something a bit uncanny about these cross-billed creatures, and their eccentricities show nowhere in greater relief than in their nesting habits. The quasi migrations of the bird are determined by the local abundance of fir (or pine) cones. Like their food supply, the birds themselves may abound in a given section one year and be conspicuously absent the next. Moreover, because there is no choice of season in gathering the seed crop, the birds may nest whenever the whim seizes them; and this they do from January to July, or even October. The communal life is maintained in spite of the occasional defection of love-lorn couples; and there is nothing in the appearance of a flock of Crossbills in April to suggest that other such are dutifully nesting.
Mr. Bowles has never taken the eggs near Tacoma, altho he has encountered half a dozen of their nests in twelve years, the only occupied one of which we have record being found by a friend on the 25th of April, 1899. It contained three half-incubated eggs, and was placed in one of a group of small firs in the prairie country, at an elevation of some twenty feet. The nest rather closely resembles that of the California Purple Finch, but is more compactly built and much more heavily lined. It is composed of twigs and rootlets closely interwoven, and boasts an inner quilt of felted cow-hair nearly half an inch in thickness. The female Crossbill exhibits a singular devotion to duty, once confessed, and in this case the collector had actually to lift her from the eggs in order that he might examine them.