Langbeschreibung
Driving across the North American Heartland, surrounded by prairie, it is almost impossible to imagine that once this was once a huge inland sea. The Western Interior Seaway, which split the entire continent of North America in half, once teemed with predatory creatures - fanged fish and turtles the size of small cars; prowling sharks and giant squid; hungry plesiosaurs and immense crocodiles. At the top of this prehistoric food chain, stretching up to nearly 15 metres (50 feet) and weighing a hefty 50,000 kilograms (50 tonnes), ruled the mighty mosasaur, the T-Rex of the sea.