Published: November 2006
Learn More
In Learn More the National Geographic magazine team shares some its best sources and other information to expand your knowledge of our featured subjects. Special thanks to the Research Division.

Related Links

The Writings of Charles Darwin on the Web
The British Library holds an enormous collection of Darwin's books, papers, and letters. A handy search function helps users wade through his works and pinpoint his musings on specific topics.

PBS's Evolution Glossary
Here's a helpful glossary that provides easy-to-understand definitions of tricky words and concepts in biology and evolution.

Sean Carroll's Research Page on Genetics and the Evolution of Animal Design
This site provides an overview of Sean Carroll's research on Hox and tool kit genes and how they guide the development of embryos to produce animals' adult forms.


Burnie, David, and Don E. Wilson, eds. Animal: The Definitive Visual Guide to the World's Wildlife. DK Publishing, 2005.

Carroll, Sean B. Endless Forms Most Beautiful. W. W. Norton & Company, 2005.

Nüsslein-Volhard, Christiane. Coming To Life. Kales Press, 2006.

NGS Resources

Sloan, Christopher. How Dinosaurs Took Flight. National Geographic Books, 2005

Quammen, David. "Was Darwin Wrong?" National Geographic World (November 2004), 2-35.

Gore, Rick. "The Rise of Mammals." National Geographic (April 2003), 2-37.

Chadwick, Douglas H. "Evolution of Whales." National Geographic (November 2001), 64-77.

Westenberg, Kerri. "The Rise of Life on Earth: From Fins to Feet." National Geographic (May 1999), 114-27.