Komodo & Rinca Islands, Indonesia
At 3-metres long, Komodo dragons are the largest lizards on Earth but, being cold-blooded, they don't need to feed as often as an similarly sized mammal would to sustain their great size; a single meal can last a dragon a month. As the apex predators on the islands of Komodo and Rinca in Indonesia on which they live, their only competition is each other. When female dragons become ready to breed once a year, rival males fight to earn the right to mate. Using their tails for support, they stand up on two legs to wrestle with each other, each trying to topple the other. Back on all fours, the males bite with jaws lined with serrated teeth and lash at each other with their muscular tails. Eventually, one dragon is bested and falls to the ground.