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> Common bird time series in Europe have shown a general decline in abundance between 1980 and 2016 (−25.4% ± 2.8)

In case anyone else was skimming through to find over what time period this occurred.

When I was a kid growing up in the London suburbs in the 70s and 80s I could remember flocks of all types of birds especially starlings and blackbirds being common place, and then, reading this article, it reminded me that I stopped seeing flocks.

Even now, living outside London, I rarely see flocks of birds, and if I do, nowhere near as large as I remember, and I don't think its observer bias either.

Thanks. It's always a bit annoying when someone throws around percentages of changes without giving the time frame.

The authors of the paper give the percentage right next to the time (as quoted), it's the submitter who has invented a new title.

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