big butterfly count

Every year since 2010, Butterfly Conservation has conducted a survey of the country’s butterflies using thousands of volunteer citizen scientists. Last year over 100,000 volunteers took part.

The big butterfly count collects data that are used to identify trends in butterfly and moth populations. Butterflies are bioindicators; they react very quickly to changes in their environment. Declining numbers show us which species of Lepidoptera are in danger and provide an early warning that other species may also be in trouble.

The big butterfly count 2019 will take place from Friday 19 July – Sunday 11 August. Here is a video to explain how it works.


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