Migrant birds carry information around the globe. When their arrival is delayed, we should worrySwifts are back in UK skies, putting an end to the annual hiatus when nature seems to hold its breath, awaiting successive waves of migrant birds whose twittering is the soundscape of summer. But these are worrying times. The swift has joined that traditional herald of summer, the cuckoo, on the RSPB’s latest red list of endangered species, following a 58% fall in their numbers since 1995.Billions of birds are disappearing, according to a report released this month. “Birds truly are the canary in the coalmine… Source – Full Article https://www.theguardian.com/commentisfree/2022/may/22/the-guardian-view-on-swallows-and-swifts-natures-messengers