Butterflies in the USA

This video from the USA says about itself:

7 August 2017

Beautiful Clouded Sulfur Butterflies, Swallowtail Butterflies and other pollinators set to relaxing ambient music.

The most extensive and systematic insect monitoring program ever undertaken in North America shows that butterfly abundance in Ohio declined yearly by 2%, resulting in an overall 33% drop for the 21 years of the program: here.

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