return of the butterfly

The large blue butterfly went extinct in the UK in 1979 despite a prolonged campaign by conservationists to try and save the species.

Prof Jeremy Thomas, head of ecology at Oxford University, said it is only now that the climate is warming and suitable spots have been discovered in the Cotswolds that the species is able to start spreading across Britain once again.
The Telegraph (UK) 28 Jun 2010 “Climate change brings back endangered butterfly”