A busy little colony, right where Luke said.
I'm amazed, but primarily at my own lack of thought. I'd always
assumed . . . but we all know where that leads. It would seem the
swallows choose a bank without regard to what may have formed it. The
fact that all the banks I've noted were formed at a water boundary had
me jumping to conclusions.
The birds do of course need water for bathing and drinking, and the
satellite view of the area shows that many of the homes to the north
have substantial swimming pools. I'll bet they have frequent visitors!
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