[JohnStudio]

Does anyone know the source of those stats?

"steep decline of animal, fish and bird numbers was calculated by analyzing 10,000 different populations, covering 3,000 species"

Logistically speaking, I'd like to know how they tracked that. I've seen how caribou are tracking in Canada rather effectively (http://mffp.gouv.qc.ca/the-wildlife/hunting-fishing-trapping...)

However, specifics of their research I'd find very interesting if indeed I could see it sited.

Any help?

[gramstrong]

Not by tracking, really, but I'd assume by population sampling. Rough counting of a species in an area or on a migration path, and then comparing it to historical data.

[stevenwoo]

There was a more recent study about insects in Europe confirming your assumption. https://www.pri.org/stories/2017-11-14/global-population-fly...

[bjoli]

Fish species used for food have been tracked in various studies, ranging from about 50-90% decline in 100 years in the 5ish studies I have read.

On my mobile with shitty 2g right now,but googling overfishing or fish pupolation is always recommended