Naturalist Charles Pickering was the librarian and a curator of the Academy of Natural Sciences. In 1843, he traveled to Africa and India to research human races. In 1848, Pickering published Races of Man and Their Geographical Distribution, which enumerated eleven races.
It lived from 98 to 83 million years ago, separating itself from the Velociraptor by roughly 10 million years. You might say it's an ancestor of the actual Velociraptor, even though the original specie of raptor was almost the size of modern chicken and the Achillobator was roughly 1 ft taller than the average person.
Both skeletons are complete and picture a Late Cretaceous struggle to the death. In mid-battle a sand dune collapsed, killing the two dinosaurs and preserving them in their death pose until 1971, when they were unearthed. In 1922, the first specimen of Velociraptor was found by the American Museum of Natural History.