INDEX 



269 



Coloration, secant, 31 



— spotted, 32 



— evolution of in mammals, 37 



— of nestlings, meaning of, 102 

 et seq. 



— " self," 37 



— survival of ancestral, 38 

 Goot, nestling, coloration of, no 

 Cormorant, feeding young of, 80 



— nostrils of nestling, 146 

 Crab, larva of, 238 



— moulting of, 239 



— device of, 249 



Crabs, eating nestlings, 89 



— glass, 240 



Cranes, nestling, coloration of, 



100 

 Crayfish, care of young in, 241 

 Crocodile, care of for young, 157 

 Cunningham, J. T., on eggs of 



ling, 214 

 Cuscuses, pouch of, 12 



Dabchick, care of young in, 63 

 Death-rate, among lions, 21 



among auks, 88 



among nestlings, 82, 83 



among penguins, 88 



among petrels, 89 



aiid weather among nest- 

 lings, 91 

 Deer, evolution of antlers in, 49 



— spotted coloration of, 33 

 Degenerates, remarkable his- 

 tory of, 265 



Dog-fish, young of, 209 

 Down, nestling, kinds of, 106, 1 50 

 Dragon-fly, larvae of, 258 

 Drinking, among nestlings, 81, 



82 

 Ducks, coloration of nestlings 



of, 100 



Eagle, Golden, play of nestling, 



95 

 , life-history of nestling, 65, 



71. U 

 Echidna, eggs of, 67 



— method of suckling, 7 

 Eel-transformation, 232 

 Eggvtooth^of birds, 144 



Elephant, hairiness of young, 5 1 



— reproductive period of, 23 

 Embryonic v. post-embryonic 



characters, 141 

 Emerald moth, strange cater- 

 pillar of, 249 



Falcon, coloration of young, 108 

 Fawn, condition at birth, 1 1 

 Fish, carrying eggs in mouth, 219 

 in pouch, 220 



— eggs of, 210 et seq. 



— embryo, breathing by fins, 22 1 

 fed on milk, 221 



reared in mussel, 223 



— larvae, yolk sac of, 209 



— nest-building of, 216 et seq. 



— transformations of young, 226 



— viviparous, 221 



Fishes, enormous numbers of 

 eggs, 213 



— viviparous, 222 

 Flamingoes, nestlings of, 70 

 Flat-fish, floating eggs of, 213 



— transformation of, 230 

 Flight, how acquired in nest- 

 lings, 6s 



Foal, condition at birth, 1 1 

 Frigate-birds, play of nestlings, 



96 

 Frog, froth-nests of, 192 



— Goeldi's, method of carrying 

 eggs, 197 



— Japanese tree-, remarkable 

 nest of, 192 



— leaf -nests of, 193-4 



— mud-nests of, 192 



— paradoxical, remarkable tad- 

 pole of, 190 



— pouched method of carry- 

 ing eggs, 197 



— tadpole, history of, 181 

 Frogs, carrying eggs in mouth, 200 



— carrying eggs on back, 197 

 Froth-nests, of fish, 218 



— of frogs, 192, 217 



Gall-flies, young devour mother, 



264 

 Geophagus, curious nursing 



habits of, 219 



