During the Cretaceous period, there was little change in the coelurosaurs (the clade containing all theropod dinosaurs more closely related to birds than to carnosaurs), except that they continued to diversify. They were composed of ornithomimosaurs, maniraptorans, and tyrannosaurs. In fact, the Cretaceous period probably had the most diverse number of—and biggest—coelurosaurs of any other period.