17-07-2025
How this summer's heatwaves are affecting breeding birds
To paraphrase Oscar Wilde, while one heatwave looks like chance, two – in one month – suggests something more serious is going on.
This summer's heatwaves across southern Britain and much of continental Europe have had a mixed effect on breeding birds. Warm, sunny days allow them plenty of time to feed and reduce the risk of their chicks dying in the nest because of spells of cold, wet and windy weather.
Yet long periods of very hot and dry weather can be equally harmful: baby birds can overheat, and some insect food can be scarce or hard to reach, especially when the ground bakes hard and dry.
In the longer term, if summer droughts become the norm, then some species will suffer, while others will benefit by shifting their ranges further north. A seminal 2021 report from the BTO, Climate Change and the UK's Birds, noted that certain groups of birds – notably seabirds and upland specialists – are already being affected negatively by the climate crisis. And while roughly half of our breeding species don't appear to be affected, we need to continue regular surveys of their populations so ensure that we can try to mitigate any harm.
Sign up to Down to Earth
The planet's most important stories. Get all the week's environment news - the good, the bad and the essential
after newsletter promotion
In the short term, the RSPB has reminded us to regularly refill our bird baths with clean water, as birds need to drink and bathe during hot weather to keep themselves healthy.
