This is a large blue butterfly video, recorded in Somerset, England.
From the BBC:
A record number of rare large blue butterflies were counted at a key breeding site during 2007.
A survey at Collard Hill, Somerset, counted 354 adults during 2007, beating the previous record of 300 in 2003.
Experts believe a warm spring helped the caterpillars at the National Trust-owned site develop quickly before the arrival of a very wet summer.
Efforts to re-introduce the species began in 1983 after it disappeared from the UK in the late 1970s.
“Despite the poor summer, 2007 was a remarkable year for the large blue at Collard Hill,” explained Matthew Oates, nature conservation adviser for the National Trust.
“It saw record numbers of butterflies in flight and it was the earliest and longest flight season since its re-introduction.”
Dr Martin Warren, chief executive of Butterfly Conservation, welcomed the survey’s findings.
“This is marvellous news for one [of] our most endangered species of butterfly,” he said.
“With seven out of every 10 butterfly species in decline, Butterfly Conservation is delighted to be working with the National Trust to save this, and other species.”
A team led by Jeremy Thomas, from the Centre for Ecology and Hydrology, Dorset, found that the survival of the butterflies was closely linked to a particular species of ant.
But the decline of pastoral grazing saw a demise in the population of these ants, which in turn caused the large blue butterfly to disappear from the UK.
He found that the ants thrived in areas with short grass because sunlight was able to warm the soil, which suited this species.
Yet a shift away from grazing resulted in sites becoming overgrown, which caused the soils to cool.
As part of the reintroduction programme by the conservationists, grazing was re-established on the sites chosen for the butterflies.
Their efforts to manage the habitat paid dividends during the summer of 2006, when an estimated 10,000 of the creatures were recorded at sites across southern England.
See also here.
While British butterflies are set for one of their worst ever years, one species is bucking the trend. After decades of hard work by conservationists, volunteers and scientists, the large blue Maculinia arion has had its best season since it was reintroduced to the country in 1984, reaching its highest numbers in Britain in 80 years: here.