10 ms·
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 historic
by gramstrong 9y ago
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 9y agoThere was a more recent study about insects in Europe confirming your assumption. https://www.pri.org/stories/2017-11-14/global-population-flying-insects-crashing-dangerously-fast https://www.pri.org/stories/2017-11-14/global-population-fly...