This is the story of saltwater crocodiles in the Northern Territory of Australia. For more than 200 million years they have successfully hunted where land meets water. Estuarine crocodiles are the largest living reptiles - adult males are often 12-15 ft, but some grow up to 20 ft in length. The crushing power of its jaw is awesome. An adult can smash the skull of a fully grown wild boar just by flexing its jaw muscles and yet they are capable of acts of surprising delicacy. This programme will film crocodiles' courtship and nesting, learn their body language of love and aggression and follow them underwater.