Andy Adcock
Worst person on Birdforum
Over the years, I've noted that in Nottingham, most Common Swifts have gone by the second week in August yet, when I'm in St Petersburg, Russia, they are evident in to late August at least.
St Petersburg is a lot further North than Nottingham so why do birds linger there longer? Is it just that the Nottingham birds move to congregate on the coast before migration which the Russian birds don't need to do?
St Petersburg is a lot further North than Nottingham so why do birds linger there longer? Is it just that the Nottingham birds move to congregate on the coast before migration which the Russian birds don't need to do?