Science, Tech, Math › Animals & Nature Achillobator's Characteristics and Features Share Flipboard Email Print PaleoNeolitic / Wikimedia Commons / CC BY-SA 4.0 Animals & Nature Dinosaurs Carnivores Basics Paleontologists Dinosaurs & Birds Herbivores Marine Reptiles Prehistoric Mammals Amphibians Birds Habitat Profiles Mammals Reptiles Wildlife Conservation Insects Marine Life Forestry Evolution View More By Bob Strauss Science Writer B.S., Cornell University Bob Strauss is a science writer and the author of several books, including "The Big Book of What, How and Why" and "A Field Guide to the Dinosaurs of North America." our editorial process Bob Strauss Updated October 26, 2019 As far as paleontologists can tell, Achillobator (the name, "Achilles warrior," refers both to this dinosaur's large size and to the large Achilles tendons it must have had in its feet) was a raptor, and thus in the same family as Deinonychus and Velociraptor. Achillobator Fast Facts Name: Achillobator (combination Greek/Mongolian for "Achilles warrior")Pronunciation: ah-KILL-oh-bate-oreHabitat: Plains of Central AsiaHistorical Period: Late Cretaceous (95-85 million years ago)Size: About 20 feet long and 500 to 1,000 poundsDiet: CarnivoreDistinguishing Characteristics: Large size; huge claws on feet; odd alignment of hips Uncertain Family Ties However, Achillobator does appear to have possessed some quirky anatomical features (mainly concerning the alignment of its hips) that differentiated it from its more famous cousins, which has led some experts to speculate that it may represent an entirely new type of dinosaur. One other possibility is that Achillobator is a "chimera": that is, it was mistakenly reconstructed from the remains of two unrelated dinosaur genera that happened to be buried in the same location. Like other raptors of the Cretaceous period, Achillobator is often depicted as sporting a coat of feathers, underlining its close evolutionary relationship with modern birds. However, this is not based on any solid fossil evidence, but the presumed featheriness of small theropod dinosaurs at some stage during their life cycles. In any case, at up to 20 feet long from head to tail and 500 to 1,000 pounds, Achillobator was one of the largest raptors of the Mesozoic Era, exceeded only in size by the truly gigantic Utahraptor (which lived halfway around the world, in early Cretaceous North America) and making the much smaller Velociraptor seem like a chicken by comparison.