Incubation for the sparrow lasts for 10 to 14 days. After the eggs are hatched, both males and females feed the young through regurgitation for another couple weeks until they fledge. Incubation of the starling eggs lasts about eleven days and then the parents feed them only soft, animal foods until the young leave the nest after 21 to 23 days.
If the nests were close together and the babies fledged at the same time there may be a little confusion. Both the starlings and sparrows are omnivorous and can adapt to numerous kinds of food. The starling parent’s instincts might kick in at the sight of the small open mouth of the sparrow eliciting an inborn response to feed.
Thank you for sharing your interesting observation.
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