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Dromaeosauridae includes some of the most fearsome killers of the Cretaceous period: Deinonychus, Velociraptor, and Utahraptor. The largest known of these is possibly Utahraptor, and the controversial Microraptor was among the smallest (40 cm?).
Troodontidae date from the late Cretaceous, and were lighter and slimmer than the dromaeosaurids. Some of these were Troodon and Saurornithoides.