Butterflies are the equivalent of the 'canary in a coal mine'. They provide us with a measure of the health of our natural environment. Their presence or absence is closely linked to the activities of people and the impact humans have on the natural world.

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The destruction and deterioration of habitats as a result of land-use change (e.g. intensification of agriculture, use of pesticides and herbicides, loss of countryside due to relentless building of new houses and industrial estates, changes in woodland management, land drainage and river dredging) are considered to be the prime cause of long-term decline of butterflies and other wildlife right across the UK.