There are now an estimated 31,000 parakeets in the UK - mostly in and around London and south-east England. And the latest "parakeet census" shows that their numbers are increasing at an average of 23% per year.
BBC Nature - Parakeets guilty of intimidating garden birds - study
BBC Nature - Parakeets guilty of intimidating garden birds - study
But this study, led by PhD student Hannah Peck...
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