Gladiators

There are clashes over precious resources when the dry season brings a band of gladiators to an African savannah watering hole. There is a lion-elephant territory brawl, an ant raid on a termite mound and a honey badger's dance with a deadly snake.

Going up against some of Australia's wiliest gladiators and their impressive arsenals and looking into whether these weapons, such as the kangaroo's deadly boxing moves, can help them survive the ravages of climate change.

Young gladiators earn their stripes in the dense tropical forests of the Americas. Watch as a poison dart frog unleashes a venomous barrage, observe a turf war between a jaguar and a caiman, and watch a bear cross paths with a defending tarantula.

Head to America's far north for a look at the ultimate brawlers living along the waterways. See how spring thaw fuels rivalries and eagles take on herons, bears against bears and dragonfly nymphs against venomous giant bugs.