Heatwave Stress Threatens Small Birds, Study Finds

A new study on Great tits (Parus major) in southwestern Iberia exposed the birds to four consecutive simulated heatwaves with daytime temperatures rising from 39 °C to 42 °C. The birds maintained body temperature control but showed higher baseline temperatures and signs of oxidative and morphological stress, indicating that repeated heatwaves disrupt thermal homeostasis and plumage structure.

Because birds cannot sweat, they rely on panting, gular fluttering and other behaviours to dissipate heat. Wildlife experts advise gardeners to help birds cope with rising temperatures by providing shade, fresh water sources, regular bathing opportunities, and planting dense vegetation that offers shelter. These measures can reduce the risk of overheating, dehydration and heat‑related mortality during increasingly frequent summer heatwaves.