2026-04-15
10 分钟Hey, it's Hannah Gelbart here.
I'm back on What in the World?
I 've just woken up, it 's about 7am here in London and I'm perched on my bedroom window
and what you can hear are the sounds of the birds.
And that screech that you just heard is from a green parakeet.
Every morning at around this time there's a huge flock of these bright green birds that flies past my bedroom window.
They're not exactly a native species here, so it is a pretty amazing sight to see.
And there are some really interesting theories as to how they came to be here.
Some people say that they come from birds that were released by the singer Jimi Hendrix back in the 60s,
or that they might have escaped when they were brought over to be filmed on a Hollywood film set.
And this kind of thing happens around the world.
In the Caribbean, there are African green monkeys that were brought over centuries ago.
And in Colombia, there are the so-called cocaine hippos,
which come from animals that were smuggled in by the late drug lord Pablo Escobar.
And some of these animals, which are from outside their natural habitat,
like the green parakeets that you heard, they can actually cause harm to ecosystems, to economies, even to people.
So what do you do when they start to take over?
And when, if ever, is it justified to kill them?
That's what we're getting into today on What in the World from the BBC World Service.
So I'm back in the studio now and we have got Esme Salad, our climate and science reporter here with me.