Velociraptor mongoliensis (Osborn 1924; Late Cretaceous, 75 mya; 6.8m long) was related to Haplocheirus and close to birds like Aurornis. One Velociraptor specimen was found in combat with a Protoceratops. The tail was long and stiffened with elongate chevrons and zygapophyses. The pubis was oriented posteriorly.
Deinonychus antirrhopus (Ostrom 1969) the shape and curvature of the sickle claw varies between specimens. Fossilized eggshells were discovered in the rock matrix that had surrounded the original Deinonychus specimen. Deinonychus might have lived and hunted in packs.