The 2 meter (6.5 feet) bone belonged to a Sauropod, some of the largest dinosaurs to ever live. It was unearthed in southern France.
Sauropods were a group of dinosaurs characterized by long necks, long tails, and small heads. Perhaps the most famous Sauropod was the Brontosaurus.
These dinosaurs used their long necks to reach plants without moving the rest of their body, allowing the resources they consume to fuel their growth. Imagine how long they had to feed in order to grow as large as they did!
In order to support their massive bodies, the bones of their legs had to grow to massive proportions. Some scientists have speculated that these dinosaurs were able to get into a tripod stance, on their tails and two hind legs, which would place a tremendous requirement on the bones of the hind legs. The bone which was found weighs about 500kg, suggesting the animal it belonged to weighed 40-50 tons.
