File:American bird magazine, ornithology (1906) (14752454615).jpg

Identifier: americanbirdmaga61906worc (find matches)
Title: American bird magazine, ornithology
Year: 1903 (1900s)
Authors:
Subjects: Birds
Publisher: Worcester, Mass. : C.K. Reed

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nd important climatic changes.He also says that many species of tropical sea birds resort each year to somerocky islet, where they may nest in safety. This is not migration in theproper sense of the term, but the object is the same that prompts the ploverto travel to the Arctic regions, and the movement is just as regular. As in AMERIOAN ORNITHOLOGY. 85 the case of the warbler, they are annually affected by an impulse to hastento a certain place. The impulse is periodic, and in a sense, common to allbirds. There is a nesting season in the tropics, just as there is a regularnesting season in the Arctic region. Why is it, then, since there is a nesting season in the tropics, that some ofthe species which migrate to the tropics do not remain there, and when theperiod of reproduction approaches, seek some retired spot where they cannest in safety.^ Because as the summer months advance, the heat of thetropical region becomes unbearable to those species which are used to a tem-perate clime.
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Photo from life by J.Catbird on Nest. H. Miller. 86 AMERICAN ORNITHOLOGY. Human beings, who are able, often go south to escape the inconveniencesof winter weather, but they do not go south during the summer months be-cause those used to a temperate clime, suffer intensely from the heat of asouthern sun. There is a certain season of the year, it is said, when par-tridges go crazy. It seems to be a temporary madness which incites themto fly miles away, in no particular direction and to no particular place. Whatthe cause is, I do not know, but it has at least one good effect which is easilyseen; it breaks up families. Were it not for this temporary insanity, thesebirds would remain, year after year, in the same locality, and thus becomeexposed to the danger of interbreeding, which would be fatal to their kind. The annual migration of other birds has naturally the same effect. Flocksof birds, such as the Robin, which have congregated in one locality ready tomigrate, are joined by others f

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