Barosaurus (name meaning "Heavy Lizard") is a genus of giant, long-tailed, long-necked, plant-eating sauropod dinosaur closely related to the more familiar Diplodocus that lived the Late Jurassic in what is now North America.
In the Series 2 episode "Land of the Giants," a herd of Barosaurus were rescued and brought to the park from Late Jurassic North America, 150 million years ago. They reside in the Sauropod Savanna Enclosure with their fellow sauropod relatives.