Extinction can be a frequent or rare event within a lineage, or it can occur simultaneously across many lineages (mass extinction). Here, a mass extinction cuts short the lifetimes of many species, and only three survive.
Image use policy: For non-commercial, educational purposes, this image may be used with a Creative Commons CC BY-NC-SA 4.0 license. Please credit as follows: © University of California Museum of Paleontology, Understanding Evolution, www.understandingevolution.org
This image is part of a series: