Swiftly Speeding to Extinction

The 'red list' of Britain's most endangered birds has been increased to 70, by the addition of four new species (https://www.theguardian.com/environment/2021/dec/01/britain-endangered-birds-red-list-rises-to-70-species). All the added species have shown substantial declines in their UK populations. Swifts, House martins and Bewick's swan all undergo substantial annual migrations. These species may be threatened en route as well as by local changes. The Greenfinch appears to have been decimated by infections, sometimes picked up from bird feeders. Many of Britain's birds are threatened by factors, including climate change and habitat loss.