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On occasion, while photographing nesting behavior, I have been lucky enough to see both parents arrive at the nest with food at the same time. The male usually waits until the 'female has fed the young. Chi one occasion, when I was photographing a nest-full of chestnut-sided warblers, the female .fed the young, then begged the .male for his contribution which she promptly swallowed.
Eyes of nestlings, closed at hatching, open on the third day. , Before that they have reacted .with blind instinct in their demand for food. Soon after the eyes open the young develop food calls that are, at first, almost inaudible. The adults hear them, however, and that is what is important. These small begging sounds seem to drive the adults into a frenzy of activity. Feeding, cleaning of the nest ' and brooding continues for two weeks or less.
As the nestling time progresses, the young become alert, sprout feathers, begin to move about and stretch; they continue to beg aggressively for food. It is time for them to leave 'the nest and the adults want •them out. Tbo much life is concentrated in one place; dispersal is the best chance for survival.
If any aspect of the nesting cycle — nest building, egg laying, incubation and feeding the young — is disrupted, the adults immediately begin a new nest at a different place in the male’s territory which he has continued to defend against intruders of the same species.
This has happened to the robin nest outside my study .window. Whether grackles robbed the nest or heavy rain caused the mud nest to collapse, I do not know. I do know that the female has been busily selecting long sections of dry grasses from the edge of the driveway. She has taken this material to the end of a branch diigh in the Norway maple where she is building a second nest. A new nest is essential.
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