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Climate change and increasing air temperature may alter environmental conditions for developing birds, with a range of phenotypic consequences for offspring. The thermal environment during incubation may impact the trade-off between growth and thermoregulation, but the effects of temperature on the ontogeny of endothermy are not fully understood. We therefore experimentally tested whether heating the nest cup of Eurasian Blue Tits (Cyanistes caeruleus) during incubation would influence cold tolerance of the chicks after hatching. Chicks from both heated and control nests showed a decrease in cooling rate with age as they became increasingly endothermic and homeothermic. However, chicks from previously heated nests cooled at a lower rate per unit surface area and from across the whole body. These chicks also had a greater body mass during the first 12 days of life, compared to chicks from control nests. Lower cooling rates in heated chicks may reflect greater thermogenic capacity or a reduced surface area to volume ratio due to a greater body mass. Future projections for climate change predict rising air temperature and increased likelihood of heatwaves, even in temperate regions. Our results indicate that nest microclimate can impact thermoregulation in offspring, and thus may be used to predict some of the future physiological responses of birds to climate change during breeding.

Experimental warming during incubation improves cold tolerance of blue tit (Cyanistes caeruleus) chicks