Round Planet

Serene as it seems, Yellowstone National Park is more unpredictable than an atom of Radium-226, thanks to the active super volcano below it.

The wildebeest, one of the many species of ungulates and "cud munchers" that populate the Serengeti, take part in a grand migration every year.

Penguins, "the natural worlds answer to Charlie Chaplin," only have to waddle about to make children -- and Amstrong Wedgewood -- smile.

The great apes, not to be confused with monkeys, have opposable thumbs, complex social politics and other "phenomenally humanlike" qualities.

Armstrong narrates a focus on bears, the largest land predators on Earth which, surprisingly, forage for some of the smallest meals available.