| web | http://www.washingtonpost.com/wp-dyn/content/article/2007/10/05/AR2007100501651.html |
| author | Seth Borenstein |
| publication | Associated Press |
| date | 2007-10-05 |
| web | R Randal Bollinger, Andrew S B... | J Theor Biol | 2007-12-21 | |
| web | Rob Dunn | Scientific American | 2012-03-01 | |
| web | Duke University | 2016-01-20 |
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