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A comment on Earth has lost half of its wildlife in the past 40 years (2014). Parent comment

Re:Earth has lost half of its wildlife in the past 40 years ... by gramstrong on Wednesday February 07, 2018 @01:15PM (#16326655)
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.
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Re:Earth has lost half of its wildlife in the past 40 years ... by stevenwoo on Wednesday February 07, 2018 @02:10PM (#16327125)
There was a more recent study about insects in Europe confirming your assumption. https://www.pri.org/stories/2017-11-14/global-population-fly...
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