Britain's naturalised parrot now officially a pest, The Independent

The ring necked parakeet, Psittacula krameri – Fairfield Matters

Parrots National Geographic

Contrary to Popular Legend, Jimi Hendrix Did Not Introduce an Invasive Parakeet to the U.K., Smart News

Crime Investigation Tool Reveals Origins Of UK's Feral Parrots

Tasman Parakeet World Parrot Trust

Britain's naturalised parrot now officially a pest, The Independent

Feral parakeets in Great Britain - Wikipedia

Wild Parrots of London, England, Rose-Ringed Parakeet (Psittacula krameri)

Parakeets spotted at Swindon country park

Invasion history of Harmonia axyridis (Pallas, 1773) (Coleoptera: Coccinellidae) in Ecuador [PeerJ]

The amazing story and the myths behind London's parakeets which have taken over the city - MyLondon

Ferrets (1852–1892)