The first two episodes of '' Dinosaur Revolution '' aired on Discovery Channel on 4 September 2011 . The final two episodes were scheduled to air 11 September 2011 on Discovery Channel . However , out of respect for the tenth anniversary of the September 11 attacks , a last-minute schedule change replaced them with 9/11-related programming . These two episodes were rescheduled to air on Science on 13 September 2011
September 11 attacks
September 11 attacks
Dinosaur Revolution