Thanks to their great ingenuity, combined with a thick fur coat, mammals can survive where no others can, in the cold of the planet's extreme frozen worlds. Here we see a polar bear learn remarkable new hunting skills and witness the rarely seen caring side of the not so mythical wolverine.

From down in the undergrowth to high above the treetops, we see how mammals have conquered every level of the forest with perfect camouflage, secret messages, and even the power of flight, but now many face new challenges as they are forced to adapt to a changing world.