What question did this study set out to answer?

This study aims to investigate the effect of acute heat on thermoregulatory responses in free-living nestling tree swallows.

Robust but transient thermoregulatory responses to an acute thermal challenge in a free-living altricial songbird

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Randomized trial tests thermoregulatory responses in nestling tree swallows, indicating potential food intake trade-offs under heat stress.

This study aims to investigate the effect of acute heat on thermoregulatory responses in free-living nestling tree swallows.
Conducted experiments on nestling tree swallows at day 6 and day 12 of development
Measured blood heat shock protein gene expression after heat exposure
Observed behavioral changes such as panting and nest position adjustments
Nestlings exhibited a significant increase in HSP gene expression immediately after heat exposure (p<0.05)
HSP gene expression returned to control levels within 24 hours and remained unchanged after one week
Behavioral observations indicated that nestlings traded off thermoregulation strategies with food begging, potentially affecting growth.

Derryberry et al. (2026) studied this question.

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Randomized trial tests thermoregulatory responses in nestling tree swallows, indicating potential food intake trade-offs under heat stress.