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PBS
Pbs Learning Media: Permian Triassic Extinction
In this video segment from Evolution: "Extinction!", geologist Peter Ward discusses evidence for a Permian-Triassic mass extinction. [2 min, 20 sec]
Smithsonian Institution
National Museum of Natural History: Qrius: Mass Extinction Solving the Dinosaur Mystery
Dinosaurs were not the only life to go extinct and leave a trail to their history. This webcast presents a paleobotanist who has studied extinction at a site in North Dakota. He discusses mass extinction. [29:16]
Crash Course
Crash Course Big History #203: Why the Evolutionary Epic Matters
This video explains the timeline of the history of life on earth beginning with one-celled organisms to the present. She discusses the mass extinctions up through today in the 6th mass extinction which is being caused by humans.