Following the scorching late June heatwave that saw temperatures soar across the United Kingdom, attention is turning to how the nation's bird populations are coping with extreme heat. Unlike humans, birds lack sweat glands, necessitating a range of unique adaptations to avoid overheating during prolonged periods of high temperatures.
Birds employ several ingenious methods to regulate their body heat. These include seeking refuge in shaded areas provided by trees, bushes, and hedgerows. They also spread their wings to facilitate air circulation around their bodies and open their bills, similar to a dog panting, to cool down. Additionally, birds can direct blood flow to their unfeathered areas, such as their bills, legs, and feet, allowing excess body heat to dissipate more effectively.
Hydration and bathing are critical for birds in hot weather. They frequently use natural water sources like ponds and streams, as well as artificial ones such as bird baths, to drink and cool themselves. However, these communal spots can also make them more susceptible to predators, including sparrowhawks and domestic cats, as they gather to access water. The extended daylight hours at this time of year offer some respite, enabling birds to rest during the hottest parts of the day and forage for food in the cooler hours of dawn and dusk.
Despite these natural coping mechanisms, sustained periods of very hot weather can still cause significant stress to bird populations. A particular challenge arises for ground-feeding species, such as blackbirds and thrushes. The parched, hard-baked earth makes it considerably more difficult for them to locate essential food sources like earthworms and other invertebrates, which burrow deeper into the soil to escape the heat.
The Met Office issued numerous warnings throughout late June, with temperatures exceeding 30°C in many parts of England, particularly in the South East and Midlands. Scotland, Wales, and Northern Ireland also experienced significantly warmer conditions than average, albeit with slightly lower peak temperatures. For instance, parts of Northern Ireland saw temperatures consistently above 25°C, while coastal areas in Wales provided some relief compared to inland regions. These conditions underscore the importance of public awareness and assistance in helping local wildlife navigate future heatwaves.