Parakeets were first reported in the wild in England in small numbers in 1969 and are thought to have become established because of persistent escapes or releases of pets.
The BTO counted 1,500 in 1996. A further study estimated numbers exceeded 6,000 in 2002.
John Tayleur, of the BTO, said the species is thriving in warmer temperatures brought by climate change and could now be up to a record 20,000. Read More...
Tags: Birds, Climate Change, Global Warming