Troodon's are considered the smartest dinosaurs due to their brain size in comparison to their bodies. Their eyes were rather large which aided them during their night time hunt meaning they were nocturnal.
Troodons appeared very briefly during the last few minutes of the episode. While intially scared of Pod they eventually adopted him into their pack.
They also appeared in Planet Dinosaur wherein they used their intellect to rob several Edmontosaurus of their young.