Each episode's production teams reveal the astounding challenges they encountered in the field

Cities are a world of surprising opportunity for the animals bold enough to live in them

Grasslands cover one quarter of all land and support the greatest gatherings of wildlife on Earth

Visit the world's deserts, where animals have developed ingenious ways of surviving

From the jungles of Brazil to Costa Rica, watch as animals face life in the most competitive place on Earth

Only a few pioneering animals have what it takes to survive in the world's great mountain ranges

For some special creatures, remote islands offer sanctuary away from the mainland