Narrator: Sauropods dominate the late Jurassic, and it will be millions of years before new dinosaur herbivores evolve to replace them. With their passing, life will never again be this large.
Narrator: [about the Allosaurus] These are the lions of the Jurassic. The top predators of their age!
Narrator: Eventually the mighty sauropods went into decline, and their lowland prairies became flooded because the sea levels began to rise. This created vast inland seas, and in the next program, we will meet the giant carnivorous reptiles that patrolled them.
Narrator: These rich sunlit waters are on the northern end of the ancient Tethys ocean, the sea that separates the Earth's two continents: one in the north, one in the south.