Investigation 2 Sources

Lizards Rapidly Evolve After Introduction to Island by Kimberly Johnson:

http://news.nationalgeographic.com/news/2008/04/080421-lizard-evolution.html

Charles Darwin & Evolution by Stephen D. Nash:

http://darwin200.christs.cam.ac.uk/pages/index.php?page_id=d3

Marine Iguana (Amblyrhynchus cristatus) by Rob Stewart: 

http://animals.nationalgeographic.com/animals/reptiles/marine-iguana/

Iguanas and Lizards by Zorica Kovacevic:

http://www.galapagos.org/about_galapagos/reptiles/