Dodo - Contains a sketch of the bird, and a short report. - http://www.nature.ca/NOTEBOOKS/ENGLISH/dodo.htm
BBC News: Scientists Find 'Mass Dodo Grave' - Explains how they found bones over 2000 years old, and how they can help scientists understand this bird. - http://news.bbc.co.uk/2/hi/science/nature/4556928.stm
Extinct Dodo Related to Pigeons, DNA Shows - Scientific article explains how Dodos evolved from birds that could fly. - http://news.nationalgeographic.com/news/2002/02/0227_0228_dodo.html
Raphus Cucullatus - Describes the biology, geographic occurrence, scientific classification, and brief history of this extinct bird. Includes an illustration. - http://animaldiversity.ummz.umich.edu/site/accounts/information/Raphus_cucullatus.html
Wikipedia: Dodo - Encyclopedia article explains how they all died, and use in popular culture. - http://en.wikipedia.org/wiki/Dodo
The Tragedy of the Dodo - Learn about the anatomy and environment impacts experienced when this bird went extinct. Also contains several sketches of what it looked like. - http://www.davidreilly.com/dodo/