This video is about a chalkhill blue butterfly.
From British daily The Independent:
Early arrival of butterflies demonstrates impact of climate change
By Michael McCarthy, Environment Editor
Published: 22 May 2007
Britain’s astounding April, the warmest on record, has produced an astounding effect in the natural world, with at least 11 species of butterfly making their earliest recorded appearances this spring in what will be seen as the most remarkable demonstration yet of the effects of climate change on Britain’s wildlife.
For several years biologists have been watching warming temperatures affect living organisms, with leaves opening, birds nesting and insects emerging earlier.
But what has happened in 2007 with butterflies has been quite exceptional.
Of our 59 resident and regular migrant species, 37 have now appeared, and of these, all except one (the orange tip) have emerged earlier than they would have done a decade ago, according to the wildlife charity Butterfly Conservation.
More remarkably still, 11 of them have broken all records for early emergence, some by scarcely-believable margins.
The Lulworth skipper, which normally appears in the third week of June, was recorded in its Dorset downland habitat near Weymouth on 28 April, seven weeks early, while the speckled wood, normally out and about at the end of March, was seen in Cornwall on 16 January, also seven weeks ahead of its record.
Other record-breakers were the large skipper (a month earlier than ever), the small blue (also a month), the meadow brown (a month), the Adonis blue (three weeks), the brown argus (a fortnight) and the holly blue (also a fortnight).
How will migrant species be affected by climate change? Here.