The ostrich-dinosaurs, or ornithomimosaurs, appeared late in the Age of Dinosaurs. Their skeletons are
, -
remarkably similar in size and overall proportions to the largest living bird, the ostrich, so they were
probably the fastest runners of their time: Bird-foot dinosaurs, or ornithopods, were plant-eaters and
included one of the best-known and most-studied dinosaurs of all, Iguanodon