In winter, lynx prowl the Yukon for snowshoe hares and manatees seek hot springs to escape the freeze; in summer, Tennessee fish build spectacular underwater pyramids, fireflies light up the forest's nights, and polar bears leap from rocks.

The most species-rich continent on Earth; in the Andes, pumas hunt guanaco while rarely seen bears search for mini avocados; in the Amazon, poison dart frogs care for their babies, colorful macaws eat clay and birds make death-defying flights.

Asia is the largest of all continents; in the frozen north, walrus congregate in extraordinary numbers, bears gather inside volcanoes and yeti-like monkeys fight in the remote forests of China; in the tropical south, the last few Sumatran rhino roam.

A land cast adrift at the time of the dinosaurs; kangaroos and wombats brave snowstorms and gum tree forests are filled with never-before-seen predators.

Wildlife survives alongside people in Europe; a baby monkey is kidnapped in Gibraltar; grave robbing wild hamsters fight in the cemeteries of Vienna; wolves roam the forests.

Antarctica is a land of survivors enduring the most hostile conditions on Earth; virtually all of the mainland is covered by ice, and even the sea freezes over, but the Weddell seal manages to survive by creating breathing holes in the ice.

Africa is home to the greatest wildlife show on Earth; chimps make tools, cheetah hunt prey twice their size and devious imposters trick fish mothers.