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I've had this sneaking suspision that both hens and roosters know if chicks are their progeny.Re: whether chickens know which offspring are theirs biologically, even if they were incubated and brooded by another, unrelated, hen (a propos Paprika setting Venka's eggs, and Venka hanging around in the coop after they hatched), I've just read this (in one of the articles in Shad's list of recommended ones):
"Fowl may be able to determine genetic relatedness by olfaction, thus enabling kin recognition", https://www.mdpi.com/2076-328X/8/1/13/htm section 3.