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English: Pectinodon is a troodontid from the Hell Creek and Lance Formations of North America. The teeth, which give Pectinodon its name, are sharp and possess deep comb-like serrations on the rear edge. It is known only from these teeth, but it can be inferred that Pectinodon was a swift biped that was covered in feathers. Troodontids are known to have had unusually large brains among dinosaurs, comparable to those of living flightless birds. Their eyes were also large, and pointed forward, indicating that they had good binocular vision, and may have even been able to see well in the dark.