Animal

E1. Big Cats

Majestic, powerful and dead, big cats were once thought to be solitary creatures. But we're now realizing just how collaborative they can be.

★ 8.0

E2. Dogs

Be it foxes on city streets or wolves on the tundra, canines rely on sharp senses, athleticism and fierce determination to punch above their weight.

★ 8.0

E3. Marsupials

It's not all about the pouches. These mammalian misfits are full of surprises, from flamboyant kangaroo showdowns to rattling koala mating calls.

★ 8.0

E4. Octopus

In changing seas and oceans, cephalopods like the cuttlefish and the giant Pacific octopus must rely on their remarkable intelligence to survive.

★ 8.0