6/6. Cities. Cities are growing at a faster rate than any other habitat on ..

5/6. Grasslands. Grasslands cover one-quarter of all land and support the v..

4/6. Deserts. The world's deserts are lands of extremes that force animals ..

3/6. Jungles. Jungles provide the richest habitats on the planet - mysterio..

2/6. Mountains. The great mountain ranges are some of the planet's most spe..

1/6. Islands. Remote islands offer sanctuary for some of the planet's stran..