If you want to know more about those parakeets, here is a recent paper: "Understanding the origins of the ring‐necked parakeet in the UK"
"explanations ranging from birds escaping from the set of the film ‘The African Queen’ to animals being released in Carnaby Street in London by Jimi Hendrix in the 1960s"
(as the paper goes on to show, neither of these are credible)
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