As the dry season brings a band of gladiators to an African savannah watering hole, see a territory brawl and one honey badger's risky dance with a snake.

Go up against Australia's wiliest gladiators and their arsenals, from a kangaroo's deadly boxing moves to the redback spider's precision-engineered traps.

Young gladiators earn their stripes in dense tropical forests. Stand back as a poison dart frog launches a toxic barrage and observe a jaguar-caiman turf war.

Head to America's far north for a peek at its waterway's fighters, as a spring thaw pits eagles against herons and dragonfly nymphs against venomous water bugs.