. Canaries, hybrids, and British birds in cage and aviary. 98 CANARIES, HYBRIDS, AND BRITISH BIRDS connection with the umbilicus or navel {â see illustration). The material needed for growth is therefore derived ])riniarily Ihroiioli the volk ; ])ut as the original volk-. YOUNG BIRD TWO DAYS BEFORE EXCLUSION, SHOWING SHRUNKEN YOLK. (Magnifial.) matter is al)soihcd, it is rc|)laced by Iresh material from the all)umen, drawn throuuh tlie delicate membranes. The albumen comiirisint; miuii of the bulk of the cifo-, it is manilest must furnish much of tVic nourishment for the younji bird ; but it ]
. Canaries, hybrids, and British birds in cage and aviary. 98 CANARIES, HYBRIDS, AND BRITISH BIRDS connection with the umbilicus or navel {â see illustration). The material needed for growth is therefore derived ])riniarily Ihroiioli the volk ; ])ut as the original volk-. YOUNG BIRD TWO DAYS BEFORE EXCLUSION, SHOWING SHRUNKEN YOLK. (Magnifial.) matter is al)soihcd, it is rc|)laced by Iresh material from the all)umen, drawn throuuh tlie delicate membranes. The albumen comiirisint; miuii of the bulk of the cifo-, it is manilest must furnish much of tVic nourishment for the younji bird ; but it ])asses thr<)Uj»h the yolk-sac in this |)rocess. Shortly before hatchiiin'. the entire reinain- in<f nutritive material of the c<fg is gathered within the considcral)ly shrunken yolk-sac, communicating with the muhilicus of the young bird, as in the ahoN'c ilhislrati<iii : and dui'ing the last few hours it is ra|)idly drawn into the abdomen, where il furnislics food for IIk' newly-born chick during the lirst da\' ol' its independent ; This matter is fully explained here in ortlcr that llic reader may (luilc understand the entire indc))cndeiicc of the young bird with regard to food f(ir at least twchc hours after its bii-|li. or even longer. Nature has furnished it with full provision, though it is rare that the jiarcnt allows the nestlings to go so long before giving them a meal. The old birds are usually busy attending to their wants an hour or two after hatching. In fact, as soon as the downy feathersâwhich are dainji when hatchedâhave been dried by the heat of the mother's body, she is busying herself about her chicks. She. however, gives them but very little food the first few hours, and that which she gives them the hrst day is of (juite a creamy consistency. When \-oung birds are hatched the abdomen is much distended, and greatly outweighs any other portion of the body. This is observable in the illustration on this page, though the yolk-sa
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Keywords: ., book, bookcentury1900, bookdecade1920, bookpublisherlondoncassell
