Britain's rarest butterflies have enjoyed a boom in numbers as conservationists say the 2018 heatwave led to a record year for some species
More than two thirds of British butterfly species were seen in greater numbers than in 2017, according to the annual UK butterfly monitoring scheme.
Among them is the large blue butterfly - which was extinct in the 1970s but has now returned in greater abundance than at any time since records began in 1976.
https://www.telegraph.co.uk/news/2019/04/07/heatwave-helps-britains-rarest-butterflies-boom-record-numbers/
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