- Committee on Recently Extinct Organisms (CREO) - collaboration by scientists around the world to standardize criteria for analyzing extinctions.
- Endangered/Extinct - profiles of animals that are either seriously endangered or extinct.
- In The Wild: Extinct - about some of the animals that once walked this planet, but are now extinct.
- On the Destiny of Species - About.com article about how extinctions come about.
- Endangerment and Extinction - includes charts and statistics about prehistoric extinctions in North America.
- Extinctions: Cycles of Life and Death Through Time - looks at the nature of the extinction process and the identified mass and minor extinctions of the past.
- Extinction - summary notes on the phenomena of extinction.
- Extinct Animal - provides information about prehistoric and recently extinct species of animals.
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