Voles and cotton rats usually live in different geographic regions, but both groups of small rodents eat grass and make runways. Yellow-nosed Cotton Rats are especially vole-like because they are small and live in grassy patches of...

The University of Michigan provides a PowerPoint presentation on the environmental history of the Great Lakes. Provides aerial shots of the Great Lakes from a satellite, various geographical maps over the Great Lake Region, and pictures...

This site provides a detailed overview of the Emperor Penguin. Content includes a focus on this bird's physical characteristics, geographic range, natural history, economic importance for humans, and more.