One dinosaur, in particular, has captivated scientists for decades as a possible “thinking dinosaur”: Troodon formosus. Small, swift, and birdlike, Troodon wasn’t the largest or most fearsome predator ...

Troodon became famous for supposedly having the highest brain-to-body ratio of any non-avian dinosaur, sparking comparisons to modern birds and even primates. Its large eyes hinted at nocturnal vision ...