Swallow numbers

Asking for a friend! A person on a Facebook bird page I’m part of posted this - “Most years, here on the Olympic Peninsula, we have a tremendous invasion of swallows in the spring (at our house, mostly Tachycineta bicolor,
T. thalassina, and Hirundo rustica). But 2020 numbers at our house were unusually low; and by August they’d already all vanished.” He was wondering if something was going on that he had missed. Has anyone got any information/ideas? Olympic Peninsula is near Seattle, for those - like me - who don’t know.

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A short article on this,
https://theplanetmagazine.net/hard-to-swallow-dd9ec2a88de1

And if you’re interested in the science they’re discussing, there are a few open access articles on Google Scholar on the subject, including
https://harvest.usask.ca/handle/10388/ETD-2012-12-816
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0129340
https://academic.oup.com/auk/article/131/3/351/5148974
https://www.degruyter.com/view/journals/ami/5/1/article-p1.xml

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Thank you very much! I’ll pass all this on.

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The person I’m referring to said these results were perfect (although in a larger sense disappointing). So again, thank you.

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