PBS
Pbs: Biogeography Polar Bears and Penguins
From the Evidence for Evolution Library at PBS, this is a short article about biogeography. The distribution of animals is one source of evidence for Darwin's descent with modification.
Other
The Evidence for Evolution: Biogeography
These pages are part of a site called "Evolution," that accompanies a textbook by the same name. Mark Ridley is the author. These pages are about the house sparrow and the differences that can be observed in it in different geographical...