Who ruled the world after the dinos died out?

Who ruled the world after the dinos died out?

Sixty-five million years ago, a mass extinction wiped out the dinosaurs.Mammals had been around since the Jurassic Period. Living alongside the dominant dinosaurs, they were just a small group of tiny, rodent-like creatures. When the dinos died out, so did many of the mammals,but the survivors evolved to become the most successful type of animals around.