. The Journal of comparative neurology and psychology. s than four times in suc-cession save in case of the bird being disturbed when in f\dl opei-ation. The following are good examples of the bowing-coo. The guttural^0 o at the end is conspicuous, and in extreme cases it is quite loud,this being highly characteristic of the l)Owing-coo. ^7^ ^. ! ^)-^i rrii r •m^ ^ cook coorr roo go o Time: 3 eroteliets per second. , 1^^ Ss s J _ J l^X cook coorr roo qoo Time: about 4 crotchets per second. (The whole lasts 2 seconds -(-). Accom-panied by a more perfect bow than the preceding. These
. The Journal of comparative neurology and psychology. s than four times in suc-cession save in case of the bird being disturbed when in f\dl opei-ation. The following are good examples of the bowing-coo. The guttural^0 o at the end is conspicuous, and in extreme cases it is quite loud,this being highly characteristic of the l)Owing-coo. ^7^ ^. ! ^)-^i rrii r •m^ ^ cook coorr roo go o Time: 3 eroteliets per second. , 1^^ Ss s J _ J l^X cook coorr roo qoo Time: about 4 crotchets per second. (The whole lasts 2 seconds -(-). Accom-panied by a more perfect bow than the preceding. These two coos were given by a bird with an unusually clear, re-sounding voice, a bird who cooed deliberately and musically. Butin many individuals the voice, instead of sounding such a deep rich Craig, Es press ions of Enioiioti /;; Pigeons. 51 tone, breaks into a liig-licr, more shrill sonnd. In some cases onlypart of the notes break into the hig-lier pitch. In other cases, thewhole strain is in a high, shrill voice, as in the following example. cook coorr koo qo 0 Time: G crotchets per : Falsetto. The female characteristically does not give the bowing-coo. Whenan adult female has been kept long in isolation, and has in conse-quence acquired almost identically the masculine bearing and behavior(p. 16), then she gives the bowing-coo like a male. But under anyother circumstances, the bowing-coo is heard from her very, veryrarely, and when heard it is of a comparativeh^ feeble and perfunc-tory type. (Ill) The nest-caJJ. The nest-call, as the name implies, is a coowhich is given typically in the nest, by either male or female, andserves to call the mate to the nest. Before the nest has been built,when the pair are hunting a nesting-site, the nest-call is used by eitherbird which has found a likely site, to call the other bird to the sj^ some other occasions, this call may be given by a bird which isnot in the nest. But in all cases the calling bird places it
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