. Biology in America. Biology. The Role of the Chromosomes 225 been given. One of tlic most striking of these color changes occurs in the male scarlet tanager, which during the breeding season wears a uniform of brilliant scarlet with black wings; after which he assumes a dull olive drab like the female, which he wears during the winter, resuming his brilliant garb in spring. Another bird with a pronounced difference be- tween summer and winter plumage is the male bobolink. We hail with joy his return to our northern fields in spring, with his bright livery of black, buff and cream, and his ri
. Biology in America. Biology. The Role of the Chromosomes 225 been given. One of tlic most striking of these color changes occurs in the male scarlet tanager, which during the breeding season wears a uniform of brilliant scarlet with black wings; after which he assumes a dull olive drab like the female, which he wears during the winter, resuming his brilliant garb in spring. Another bird with a pronounced difference be- tween summer and winter plumage is the male bobolink. We hail with joy his return to our northern fields in spring, with his bright livery of black, buff and cream, and his ring- ing, cheery song. In the fall, when in his dull drab coat. Effect of Diet on Body Form in- Amblystoma Fig. 1, young cannibal after full meal. Fig. 2, typical larva. Figs. 3-5, young cannibals. Fig. 6, normal larva, typical of the ordinary specimens among â which the cannibals were found. From Powers, "Morphological Variation and its Causes in Amblystoma ; Studies from the Zoological Laboratory of the University of Nebraska, Vol. IV, No. 71. he gathers in flocks of thousands upon our marshes, we shoot him as the plump little "reed bird"; while over the rice fields of the Carolinas, upon his return from his summer sojourn in the North, he meets an even worse reception from the rice grower as his inveterate enemy, the "rice ; Immediately following the breeding season, i. e., at the time of the fall molt, birds are usually in poor condition both in respect to feathers and flesh. Some male tanagers and bobolinks in the New York Zoological Gardens were pre- vented from breeding for one season, during which time they remained in full song and excellent physical condition and retained their full breeding plumage. About a month previous. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the
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