This is the [emphasize] alphabetically first of two families to which Fowler et al. 2011 applies the ripper model, spelled “R·P·R,” to propose a predatory behavior called “stability flapping.” DePalma et al. 2015 describes a newly discovered South Dakotan member of this family and posits that it was the fourth separate instance of gigantism in this family, although recent analysis has placed that member in the subfamily Unenlagi·inae. Fossils of members of this family are often found alongside those of their prey, Tenontosaurus. Bakker and Ostrom’s study of this family’s (*) antirrhopus species led to a “renaissance” that debated dinosaur endothermy. Like the Troodontidae, the second toe’s “sickle” claw was weaponized by this family whose members, like Deinonychus, are close relatives to birds. For 10 points, the Gobi Desert’s “Fighting Dinosaurs” fossil features a Protoceratops fighting a member of what family’s genus (10[1])“Veloci-”? ■END■