Just out of the town centre I was surprised to see a number of small martins zipping across the canal - it was at a very closed-in point with building up close on both sides. They were appearing from the wall of the canal. Apparently they set in a number of pipes specially for them.
I watched for a while entranced because they were SO close. They were of course too fast and agile to get anything really good in flight (and I got only a very fuzzy shot of 3 trying to get into a hole at the same time), but here's the best of what I got.
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