Which Swift do you folks get to see? By me we have had about a dozen Chimney Swifts for the first time ever. Has been super fun listening for them and then finding them. Hard as heck to get a photo of though. They seem to left though, been a few days since we have seen or heard any.
Well it is known that Swifts breeding in London feed as far as Spain daily, so that distance in just a few hours is no problem.
They can pack their throats with flies (to bring back to the nest) & are known to do this when starting out in migration - probably a good idea when crossing the Sahara.