It’s incredible that so many birds cram into the tiny spaces underneath the bridge. But the battle for living spaces is now an everyday fact of city life.

The most populated North American city is New York.

Here space is a precious commodity with more than 8 million people fighting for their share.

With so little ground space left, having a garden can require a head for heights.

It’s difficult to imagine any animal getting a foothold in this bustling city. But some do.

The red-tailed hawk is well known in midtown Manhattan. It manages to survive here, because New York has the ultimate in urban gardens, Central Park. This park created in the mid-1800s has become a focal point for wildlife and the people of Manhattan.