The First Morning Song of Some Birds of Washington, D. C.; Its Relation to Light
- 1 September 1930
- journal article
- research article
- Published by University of Chicago Press in The American Naturalist
- Vol. 64 (694) , 436-469
- https://doi.org/10.1086/280329
Abstract
The first morning calls or songs of 14 birds common in the vicinity of Washington, have been recorded, and plotted in relation to the curves of Civil Twilight and sunrise. The data indicate that all the birds are highly sensitive to the coming day, some species appreciating very low light intensities with considerable accuracy. Certain analogies are drawn between this behavior of the birds and the migration urge. The opinion is expressed that the exactness of the migratory movements, like the exactness of the timing of the first morning expressions, is in some manner dependent upon the sun.This publication has 1 reference indexed in Scilit:
- Bird Migration from the Point of View of Light and Length of Day ChangesThe American Naturalist, 1928