Answer: The dire wolf was a plus-size predecessor of the modern dog and a close relative of the grey wolf a carnivore that also scoured Pleistocene North America. As the genus Canis goes, the dire wolf was pretty big. Some may have weighed up to 200 pounds, though 100 to 150 pounds was normal. This predator had powerful, bone-crushing jaws and teeth, used mostly for scavenging rather than hunting. The discovery of huge numbers of associated dire wolf fossils is evidence of pack behavior. Dire wolves had significantly smaller brains than grey wolves, which may explain how the latter helped drive it to extinction. Also, the dire wolf's legs were much shorter
Despite its popular name, the saber-toothed tiger was only distantly related to modern tigers, lions, and cheetahs. The Smilodon fatalis dominated North (and eventually South) America. The Greek name Smilodon roughly translates as "saber tooth." Its notable weapons were its long, curved teeth. However, it didn't attack prey head-on with them; it lounged in low tree branches, pouncing suddenly and digging its enormous canines into its victim. Some paleontologists believe that the tiger also hunted in packs, though evidence is less compelling than for the dire wolf.
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