|House Sparrow, a bird of urban areas.|
Birds are all around us and just because you live in a town or city doesn't mean you can't watch birds. The popularity of the RSPB's Big Garden Birdwatch shows how many birds you can see in your own garden.
Birds see our green and brown spaces and abandoned buildings as habitat, where they can rest and refuel while on migration, feed and even nest and breed.
David has travelled around the world and in all the urban areas he's visited he manages to find surprising birds in the most unusual places.
The majority of people are totally oblivious to the wildlife right on their doorstep.
(Photo credit: Wikipedia)