We also show higher body temperatures were selected for - again this was independent of growth.

We find negligible heritability of body temp and strong effects of the natal environment after thermal independence. We also show correlations in body temp between early and mid stages was explained by natal environment effects. Importantly these effects were independent of growth.

We conducted a cross-foster experiment and measured surface body temperatures using thermal imaging throughout the nestling period.

We conducted a cross-foster experiment and measured surface body temperatures using thermal imaging throughout the nestling period.

We conducted a cross-foster experiment and measured surface body temperatures using thermal imaging throughout the nestling period.