ELI5: Explain Like I'm 5

London Underground mosquito

There's a type of mosquito in London called the London Underground mosquito. It's a special kind of mosquito that can only live in the dark, underground places like the London Underground, a series of tunnels and trains that go across London. It's an annoying little bug that buzzes around, but luckily, it doesn't bite people. It lives on small amounts of water and helps to keep the air fresh in underground places.