. Audubon . evarious calls of the old hento her chicks. Her vocab-ulary is not extensive butno one would deny the factthat she has a method ofconveying many differentinstructions to her all crouch when shecries hawk, they scatterwhen she cries cat, andthey rush to her when shecries food, etc. Otherbirds are just the samebut it takes a discerningear in catch the differencesin notes, and it is impos-sible to put them in calls are usuallyrecognized by all speciesof birds and they fly to thes< ene of trouble. Whetherthe other notes are under-stood by all species, orwh
. Audubon . evarious calls of the old hento her chicks. Her vocab-ulary is not extensive butno one would deny the factthat she has a method ofconveying many differentinstructions to her all crouch when shecries hawk, they scatterwhen she cries cat, andthey rush to her when shecries food, etc. Otherbirds are just the samebut it takes a discerningear in catch the differencesin notes, and it is impos-sible to put them in calls are usuallyrecognized by all speciesof birds and they fly to thes< ene of trouble. Whetherthe other notes are under-stood by all species, orwhether each species hasits private language, webave no very good way of knowing. Ii is a study that will take a refinementof observation that wehave not yel attained, and there is no m-<.\ of theor-izing lure upon a subjeel for which we have so few facts. It is said thai the call Holes of a bird are instinctive and thai ils song islearned by imitation, but the latter fact has not been entirely proved. Cer-. OST BIRDS I I III. I in il) FAR DOWN 1\ I 111 THROATS 01 rHE YOUNG, AS SHOWN WITH TH1 RED \\ BLACKBIRD The Audubon Societies tainly a Crow will caw and a Duck will quack whether or not it ever hears any others of its kind, and I am inclined to the belief that a Robin would sing like a Robin if it never heard any other bird sing. But when young birds are raised by other species, never hear their own kind and continually hear the songs of their foster parents, they do seem to acquire songs resembling more those of their foster parents than their own. We should remember, however, that the power of imitation is quite general among birds and not confined to the Mockingbirds alone, though with them it reaches its greatest perfection. The only fair test would be to raise a young bird to the singing stage without its hearing any other song and, to the best of my knowledge, this has never been done. All young birds by thetime they leave the nesthave well - developed dis
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