BBC: Butterflies suffered in last year's wet and cold weather, having their worst year since 1976, a charity says.
Only four of the 56 species studied in the UK Butterfly Monitoring Scheme saw an increase in population size.
The relentless rain and cold of 2012 meant that in particular summer species struggled to find food, shelter and mating opportunities.
The scheme looked at how a range of species did at more than 1,000 sites across the UK.
The black hairstreak, one of the UK's rarest butterflies,...