Papua New Guinea is home to the saltwater crocodile, the largest croc on Earth. These waters are prime real estate for hunting and mating. This female croc patrols her territory. A younger female moves to challenge her. Their turf war is short, the trespasser has been driven off. The commotion attracts a large male. This is his territory, too. Female crocs sometimes take the lead in courtship. This one rubs the male's snout, then blows bubbles under his sensitive jaw. >She's got his attention. Now, he takes the lead. With a raised snout, she signals submission to avoid attack. Now, she slides beneath him. They mate. And when it's over, go their separate ways.