From Good Animal News:
A RARE songbird has tripled in number in 13 years and returned to Wales, The Royal Society for the Protection of Birds said yesterday.
But the Dartford warbler’s population increase can only be sustained and improved if the Government protects the birds’ natural habitat, the RSPB said.
The UK population of Dartford warblers increased from 1,890 pairs in 1994 to an estimated 3,208 pairs, according to a recent survey.
The bird has returned to Wales, the Midlands and East Anglia, and there are 85 pairs in the Channel Islands.
The population growth is a massive jump from 1963, when just 11 pairs were counted.
Milder winters and the availability of heathland have helped numbers increase, according to the RSPB.
The bird has also adapted to new habitats.
See also here.