Barosaurus

The rearing Barosaurus facing an Allosaurus in the Theodore Roosevelt Rotunda, the entrance hall of the American Museum of Natural History in New York. Rising about 50 feet, it is billed as the world's tallest freestanding dinosaur mount, and it has greeted visitors since 1991. The pose is only possible because every bone is a cast: real fossils would be far too heavy to hold up on their hind legs like this. The scene shows a parent rising to defend its young, so look for the small juvenile Barosaurus at its feet.