Update 1.5 was the third free update for Jurassic World Evolution, released alongside Secrets of Dr. Wu on November 20, 2018. Additions include Group Leaders, individual dinosaurs which others will flock and herd around. This oft-requested herding feature will allow dinosaurs to remain in close proximity to other members of their species, and will tie into a new sleeping behavior when dinosaurs are idle, allowing them to sleep in groups. Another added feature is a dynamic day-night cycle, which will be included automatically in Sandbox and Challenge modes, but will require a five star rating on each island in the career mode to unlock. Other features include new contracts and high capacity feeders.