Help to take nature’s pulse by joining the biggest ever nationwide survey to assess the health of our environment from 16–31 July 2011.

Butterflies are very sensitive to their surroundings so are good biodiversity indicators. A decline in butterfly numbers gives an early warning signal that a habitat and its wildlife are at risk.

To take part in Big Butterfly Count just count butterflies for 15 minutes during bright, preferably sunny, weather in your garden, local park or any green space. There is an identification chart to help you identify which butterflies you see. Make a note of the number of different butterflies you spot and add your records online.

The Big Butterfly Count was launched last year and over 10,000 people took part. The survey is being run by Butterfly Conservation and backed by their President, Sir David Attenborough.