Marine iguana (Amblyrhynchus cristatus hassi) - Santa Cruz Island, Galapagos National Park, Ecuador
Two male iguanas butt heads on a beautiful beach in the Galapagos Islands 600 miles off the coast of South America. These iguanas are usually pretty mellow animals but all it takes is a male iguana wandering into another male territories and the iguanas can spring into action. Butting heads and pushing each other around like two reptilian sumo wrestlers, each trying to shove his opponent backwards. Once a iguana loses a certain amount of ground it acknowledges his defeat and moves off. The largest iguana is most often victorious and controls a prime piece of territory with many females within.