|Named By:||Altangerel Perle, Mark A. Norell & Jim Clark in 1999|
|Time Period:||Late Cretaceous, 89 Ma|
|Location:||Mongolia, Dornogovi Province - Bayan Shireh Formation|
|Size:||Estimated 6 meters long|
|Fossil(s):||Partial remains including vertebrae, hindlimbs, forelimbs, shoulder, ribs, as well as an upper jaw fragment of the premaxilla with teeth|
|Classification:||| Chordata | Reptilia | Dinosauria | Saurischia | Theropoda | Dromaeosauridae | Eudromaeosauria | Dromaeosaurinae ||
Achillobator ( a-KILL-a-BAY-tohr) is a dromaeosaurid theropod dinosaur that lived roughly 98 to 83 million years ago during the Late Cretaceous in what is now Mongolia, in Asia. It was among the largest dromaeosaurs; the holotype and only known individual of Achillobator is estimated at 5 to 6 m (16.4 to 19.7 ft) long. Achillobator was a moderately-built, ground-dwelling, bipedal carnivore. It would have been an active predator, hunting with the enlarged, sickle-shaped claw on the second toe.