My answer to Which dinosaur would dominate the earth today if humans had never existed?
Answer by Vijayendra Mohanty:
This is just speculation of course, but perhaps it would have been a descendant of the Saurornithoides.
The likelihood has been hinted at by Carl Sagan and later by John Gribbin. Saurornithoides were smaller, had hands that resembled ours, had larger brains, and were even bipedal. In the event of a global catastrophe like an ice age, they might have survived because they required less food than larger dinosaurs. They were omnivorous.
And here is something else that is interesting. If the Saurornithoides had indeed evolved into something resembling us and invented mathematics, it would not have been base ten (decimal) math. It might have been been a base six system because the Saurornithoides had three fingers on each of their forelimbs.