Uploaded March 2025 | Updated September 2026, 1 week ago

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Throughout history, there have been 5 major mass extinctions—this video covers the first one: The Ordovician mass extinction. We’ll be going through what life was like before this extinction occurred, what exactly happened, and the evidence we have for why it happened. This is episode 1 of a 6-part series on the mass extinctions of the past, as well as the one we’re headed into now. So buckle up! And stay tuned for the rest of the episodes coming out every week on @Colossal's channel: youtube.com/watch?v=BP0HJXTHaZ8