Go to the zoo, take a look at an ostrich, and you'll see where this dino got his name.
The best known of the Ornithomimids (a family of fast-running, lightly built carnivores),
Struthiomimus probably ate eggs, insects, and various small animals. Instead of teeth, it had a toothless "beak."
This animal was first discovered in 1914, and named by paleontologist Henry F. Osborn in 1916.
The most complete Struthiomimus fossil found to date was nicknamed "Margie." It was found in the Hell Creek Formation in Montana
around 2004 (I can't find an exact date on that find).
According to several sources, there is an ongoing debate as to whether Struthiomimus and Ornithomimus
are the same dinosaur.
Marx's Struthiomimus drags its tail, whereas the real dino's tail was held straight out behind
the animal. The real Struthiomimus' tail was actually stiff. Marx's figure is most likey a tail-dragger to make it stand up.
This figure looks good, and other than the dragging tail, seems pretty on the mark to me.