4/5. Matthew Parris continues his exploration of London's wildlife with a look below the Capital's streets. He discovers rare bats in disused London Underground tunnels and takes a closer look at the lives of the mice he's spent many hours watching from Tube platforms.
But these aren't the only animals to adapt to the warm habitat which exists far beneath the London streets: the Underground also has its own unique species of biting mosquito.
5/5. Matthew Parris concludes his exploration of London's wildlife with a look at the exotic and unusual species which are quietly taking up residence in the city's parks and gardens - from the Australian beetle which turned up in a Chelsea pub to the alien invaders of the plant world.
Matthew also tries his hand at urban fox-watching and he looks ahead to the wildlife of London in a century's time.