Swallow skimming the water back in the middle of the summer.
Technically, it's a Barn Swallow, Hirundo rustica, but given we commonly only see this species and only rarely other swallows, they're generally called "swallows" in the UK.
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@sciencebase Where's it barn, then? Africa?
Even in Yorkshire, no one says 'barn' to mean 'going' anymore. Or 'Laith' to mean 'barn' either.
@sciencebase They'll never get a CE mark for those silly tails.
@SteelFolk no they're barn in Europe