AUDIO: How to count butterflies for science

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Sir David Attenborough urges public to count butterflies

July 18 2014 Last updated at 11:00 BST

Sir David Attenborough has called to go out and spend 15 minutes counting the butterflies in your area.

Speaking before the launch of the Big Count Butterfly, Sir David said it was an example of "priceless" contribution of citizens in science.

Sir David added that the number of tracks indications were "exciting" before the bill this year.

On BBC Radio 4 broadcast 's Today program on Friday, July 18.

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