This 13 December 2018 video from England says about itself:
Saving UK Cirl Buntings from Extinction
Cirl buntings were on the edge of UK extinction in 1989, with only 118 pairs located in South Devon. But by working with farmers to restore their habitat, the once small Devon population boomed.
In 2006 the RSPB, in partnership with National Trust, Natural England, Paignton Zoo and The Zoological Society of London, launched an ambitious project to establish a second population on the Roseland Peninsula, Cornwall. Meet the Devon cirl bunting chicks who moved to Cornwall to birth a new population.