A lynx searches the snowy Yukon for snowshoe hare; manatees take refuge in a Florida hot spring; a fish mating ritual is examined; polar bears go hunting.

A voyage through the Earth's shallow waters, where sunlight filters through the ocean waters and illuminates the lives of a humpback whale and her newborn calf.

Spring brings about the sun and katabatic winds, endangering adelie penguins; elephant seals fight on a densely populated beach; a bear caterpillar emerges.

A comprehensive look is taken into how mountain ranges, perpetual night, pressure and temperature extremes create unusual life forms.

Emperor penguin chicks born on the ice in winter are abandoned by their parents in the spring, so they must navigate their way across the sea ice.

David explores Earth's precious freshwater reserves to observe the incredible animals that inhabit it.

Rare pygmy three-toed sloths live peacefully; predators pose little threat to albatrosses; young marine iguanas fight for survival the moment they hatch.

Asia's jungles are exceptionally diverse, but while they provide shelter, food and opportunity, they are also full of dangers and hidden threats.

In the green seas of the Earth, sunlight brings life to vast kelp forests, mangroves, seagrass prairies and algae blooms, and animals fight for space and food.

Clever meerkats encounter an even smarter bird; black rhinos meet for a surprisingly social gathering; aggressive giraffes fight over the limited resources.