nest

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Parents tended to make the first offer of food to a fake nestling near a speaker broadcasting the deprived-chick's call rather than one putting out a better-fed chick's call.
7 PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON B, they propose that the gape redness of a begging nestling indicates whether the young bird is battling infection.
Using blood samples obtained from the baby birds, the researchers calculated the amount of carbon dioxide produced during respiration -- a measure of nestling metabolic rate and thus energy expenditure.