148 Index. 



Y. 



Young, as strong lure, xvii, 6, 126, 127, 130; exposure of, to intense heat, 8; study of, at nest, 8; danger 

 to, from insufficient food, 10; proper age of, when nesting site is changed, 6; necessity of shade 

 to, 8, 13; of Cedar-bird, 18, 60; of Baltimore Oriole, 18, 19; frequency of feeding, in Orioles, 

 19; call-notes of, in Oriole, 18; exercise of, in Oriole, 20; flight from nest of, in Oriole, 20; 

 feeding of, in Redwing Blackbird, 2 1 ; hatching of, in Kingbird, 2 1 ; change of, in nest of King- 

 bird, 27; feeding, in Kingbird, 27, 28, 103; brooding in Kingbird, 28, 94, 97; flight of, from 

 nest in Kingbisd, 28; gape, color of mouth, and behavior of, in Robin, 39, 40, 47; flight of, 

 from nest, in Robin, 40, 47, 48; cats as enemies of, 51; instinctive reaction of, to food in Cedar- 

 bird, 55; hatching of, in Cedar-bird, 58, 59; opening of eyes of, in Cedar-bird, 59; of Cedar- 

 bird leaving the nest, 18, 60; time spent in nest by, in Cedar-bird, 60; appearance of feather- 

 shafts and wax-like appendages to wings of, in Cedar-bird, 60 ; development of color-marks of, 

 in Cedar-bird, 60, 61 ; habits of, in Cedar-bird, 60 ; food and care of, in Cedar-bird, 55-62 ; cleaning 

 of, in Cedar-bird, 56, 105-107; digestion, assimilation, and growth of, in Red-eyed Vireo, 66; 

 behavior of, in Red-eyed Vireo, 64-68; preying instinct of, in Red-eyed Vireos, 67; aroused 

 by notes of other birds, 68; appearance of fear in Red-eyed Vireos, 69; rate of feeding of, 

 in Red-eyed Vireos, 69; response and feeding of, in Bluebird, 73; food and rate of feeding, in 

 Bluebird, 75; feeding and care of, in Catbird, 77, 78, 79; rate of feeding of, in Catbirds, 78; 

 behavior of, in Catbirds, 78, 79; of Night Hawk, 80; hatching of, in Night Hawk, 80; color of, 

 in Night Hawk, 80, 85 ; eyes of, in Night Hawk, 80 ; behavior of, in Night Hawk, 80-82 ; walking 

 of, in Night Hawk, 81; coralling of, in Night Hawk, 81; call-notes of, in Night Hawk, 81, 82; 

 feeding habits in Night Hawk, 81, 82, 85; fledgling stage in Night Hawk, 85; call-notes of, in 

 Kingfisher, 90, 91, 92; colors of, in Kingfisher, 86, 91, 92; peculiar expression of, in Kingfisher, 

 91; development of feathers of, in Kingfisher, 86, 91; function of tarsus of, in foot of King- 

 fisher, 89; general habits of, in Kingfisher, 89, 91, 92; habit of walking backward in, of King- 

 fisher, how acquired, 89 ; habit of sitting still, in Kingfisher, 89, 90; pugnacity of, in Kingfisher, 

 89; feeding of, in Kingfisher, 90, 91; habits of, in captive Kingfishers, 92; care of, 94; brooding 

 and feeding of, 94-103; diet of, in Cedar-bird, 101; automatic response of gullet of, 101, 102; 

 inspection and cleaning of, 103-110; character of excreta in, 104; disposal of excreta of, by 

 parents, 104-107; character of excreta in Kingfisher, 107; use of excreta of, as food by adults, 

 105, 107, 109; development of fear of , in Catbird, 117, 118, in Chestnut-sided Warbler, 118, 

 in Kingfisher, 119; imperfect digestion of food in, 109; fear in, 117-122; condition of, at time 

 of hatching, as basis for classification, 117; fear in Black Ducklings, 120; death of, due to 

 premature development of fear, 120, 121; lack of discrimination in, 121; behavior of, in Bal- 

 timore Orioles, 121; care and education of, 121; acquisition of fear of special objects in, 121; 

 use of pot-belly of, 121 ; of Bay-winged Bunting attacked by black snake, 123. 



