Mr. Allen did not meet with this species in Western Kansas, and it is not included in his list of birds observed by him near Fort Hays. At Ogden and Salt Lake City, in Utah, which he reached the first of September, Bullock’s Oriole had already migrated southward.
In all the fertile portions of the country west of the plains, Mr. Ridgway found Bullock’s Oriole—the western representative of the Baltimore—extremely abundant. In May, when the valley of the Truckee, near Pyramid Lake, was visited, he observed great numbers feeding upon the buds of the grease-wood, in company with the Louisiana Tanager and the Black-headed Grosbeaks. In certain localities there was scarcely a tree that did not contain one or more nests of these birds, and as many as five have been found in
a single tree. Although constructed in a manner almost precisely similar to those of the common eastern species, its nest is less frequently pendulous, being in many cases fixed between the upright twigs near the top of the tree. It is, however, not unfrequently suspended, like that of the Baltimore, from the extremity of a drooping branch, though very rarely in so beautiful a manner. The notes of this Oriole, which are similar to those of the Baltimore, are neither so distinct, so mellow, nor so strong, and their effect is quite different from that produced by the splendid mellow whistling of the eastern species; and the mellow, rolling chatter so characteristic of the latter is not so full in the western species, and generally ends in a sharp chow, much like the curious mewing of an Icteria. He regards Bullock’s Oriole as altogether a less attractive species.
Mr. Lord found this bird by no means an abundant species in British Columbia. Those that were seen seemed to prefer the localities where the scrub-oaks grew, to the pine regions. He found their long, pendulous nests suspended from points of oak branches, without any attempt at concealment. He never met with any of these birds north of Fraser’s River, and very rarely east of the Cascades. A few stragglers visited his quarters at Colville, arriving late in May and leaving early in September, the males usually preceding the females three or four days.
On the Shasta Plains Mr. Lord noticed, in the nesting of this bird, a singular instance of the readiness with which birds alter their habits under difficulties. A solitary oak stood by a little patch of water, both removed by many miles from other objects of the kind. Every available branch and spray of this tree had one of the woven nests of this brilliant bird hanging from it, though hardly known to colonize elsewhere in this manner.
Dr. Coues, in an interesting paper on the habits of this species in the Naturalist for November, 1871, states that its nests, though having a general resemblance in their style of architecture, differ greatly from one another, usually for obvious reasons, such as their situation, the time taken for their construction, and even the taste and skill of the builders. He describes one nest, built in a pine-tree, in which, in a very ingenious manner, these birds bent down the long, straight, needle-like leaves of the stiff, terminal branchlets, and, tying their ends together, made them serve as the upper portion of the nest, and a means of attachment. This nest was nine inches long and four in diameter.
Another nest, described by the same writer, was suspended from the forked twig of an oak, and draped with its leaves, almost to concealment. It had an unusual peculiarity of being arched over and roofed in at the top, with a dome of the same material as the rest of the nest, and a small round hole on one side, just large enough to admit the birds.
The eggs of this Oriole are slightly larger than those of the Baltimore, and their ground-color is more of a creamy-white, yet occasionally with a distinctly bluish tinge. They are marbled and marked with irregular lines and
tracings of dark umber-brown, deepening almost into black, but never so deep as in the eggs of the eastern species. These marblings vary constantly and in a remarkable degree; in some they are almost entirely wanting. They measure .90 of an inch in length by .65 in breadth.
Subfamily QUISCALINÆ.