Dinosaur Death - Walking with Dinosaurs - BBC

Carbon Monoxide steams from the ground suffocating the dinosaurs and marking the start of the natural process that led to their extinction. Broadcast in 1999, Walking with Dinosaurs set out to create the most accurate portrayal of prehistoric animals ever seen on the screen. Combining fact and informed speculation with cutting-edge computer graphics and animatronics effects, the series took two years to make.