I imagine that big raindrops must be quite a hazard for insects, they are no fun for humans generally, either.
Sand Martin - Riparia riparia
But when the rain is hard enough, the insects are beaten down and make a flying feast for swifts and swallows. There was a high proportion of Sand Martins with a group of mostly Barn Swallows, and I mused on the various names we humans have for
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