. Beginners zoology. Zoology. 158 BEGINNERS' ZOOLOGY like the leaves of trees, are delicate structures and lose perfect condition with age. Hence the annual renewal of the feathers is an advantage. Most birds shed twice a year, and with many the summer plum- age is brighter col- oured than the win- ter plumage. When a feather is shed on one side, the corre- sponding feather on the other side is. Fig. 295. —Wing of Bird. /, false quills (on thumb); 2, primaries; j, secondaries; tertiaries (dark) are one above another at right; a, i, coverts. always shed with it. (What need for this ?) A large o

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. Beginners zoology. Zoology. 158 BEGINNERS' ZOOLOGY like the leaves of trees, are delicate structures and lose perfect condition with age. Hence the annual renewal of the feathers is an advantage. Most birds shed twice a year, and with many the summer plum- age is brighter col- oured than the win- ter plumage. When a feather is shed on one side, the corre- sponding feather on the other side is. Fig. 295. —Wing of Bird. /, false quills (on thumb); 2, primaries; j, secondaries; tertiaries (dark) are one above another at right; a, i, coverts. always shed with it. (What need for this ?) A large oil gland is easily found on the dorsal side of the tail. How does the bird apply the oil to the ^^ ^ feathers ? 5', _ B. 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 original Coleman, Walter M. Toronto : Macmillan

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921