Weatherwatch: Climate crisis fuelling steep fall in migratory bird numbers

Many species under threat use the African-Eurasian flyway, one of the planet’s largest mass-migration systems

It may still feel like summer, but in the world of birds, autumn migration is already well under way. Cuckoos and swifts have already left us, and while swallows and many species of warbler will not depart our shores until September, many species of Arctic-breeding waders have begun to stop off at our coastal marshes to refuel for their long journey south.

This year, however, there could be fewer than usual. A review by the British Trust for Ornithology, working with other international conservation organisations, has found that more than half of these global travellers are suffering major declines in numbers – a worrying downward trend. Many of those under threat use the African-Eurasian flyway, one of the largest mass-migration systems on the planet.