Islands are often isolated, creating unique, somewhat specialized fauna, as notably terrestrial species ar stuck and adapt separately. Special conditions can include the absence or inescapability of predators, scarcity of partners and harsh conditions such as weather or volcanic activity, which also creates new islands, as in the Galapagos. Even tiny islands also may have unique populations, even large ones like Madagascar entire types. Some species thrive surprisingly, like Komodo monitors on their Indonesian Island or even penguins on Antarctic ones. Written by KGF Vissers
Mountains are pretty demanding environments, so its inhabitants need to evolve into very though species. The Hiamlayas are highest and coldest, starring the very rare snow leopard, covering huge territories due to few prey. Nubian capricorns became utter acrobats to seek safety on steep, scorching-hot Arabian slopes, yet must come down for water. The Rockies are empty in winter except for hibernating (grizzly) bears, who must fatten up when spring comes suddenly. Africa's Kilimanjaro range is always tropical, except for the icy nights. Finally the Andes. Written by KGF Vissers
Jungles provide the richest habitats on the planet - mysterious worlds of high drama where extraordinary animals attempt to survive in the most competitive place on earth. Flooded forests are home to caiman-hunting jaguars and strange dolphins that swim amongst the tree tops, while in the dense underworld, ninja frogs fight off wasps and flying dragons soar between trees. Acrobatic indri leap through the forests of Madagascar, while the jungle night conceals strange fungi and glow-in-the-dark creatures never filmed before. Written by BBC One
Grasslands cover one quarter of all land and support the vast gatherings of wildlife, but to survive here animals must endure the most hostile seasonal changes on the planet. From Asia's bizarre-looking saiga antelope to the giant anteaters of Brazil, grassland animals have adapted in extraordinary ways to cope with these extremes. In the flooded Okavango, lions take on formidable buffalo in epic battles, on the savannah bee-eaters take advantage of elephants to help catch insects and, on the freezing northern tundra, caribou embark on great migrations shadowed by hungry Arctic wolves.
3% of Earths land mass is covered by cities with an additional 40% devoted to agriculture. With 33% being harsh desert environment, this leaves very little space for animals to live. The Planet Earth crew will show how some species have learned to adapt and thrive in this new environment while others have been impacted in a negative way. Written by Justin Iaconetti