These migratory birds breed here and then go to central Africa on migration. They only stop a few months, then they go. One day they are on the wing screaming in feeding parties. Then the skies fall silent until next spring. Most leave in August. Although numbers are lower, I cannot say I have noticed. There are far fewer swallows here.
See https://www.rspb.org.uk/birds-and-wildlife/wildlife-guides/bird-a-z/swift/.
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