University of Wisconsin
The Why Files: On the Wing: Birds, Skeeters, Jet Planes
Evolution through natural selection governs the "design" of flying creatures. Engineers design flying machines. But flying is about physics, and physics is the ultimate arbiter of both processes, and that produces parallels in mechanical...
Animal Fact Guide
Animal Fact Guide: California Condor
This reference material explores the largest flying bird in California, the condor. Learn about its habitat, diet, physical characteristics, and much more!
Museums Victoria
Melbourne Museum: Meet the Skeletons: Genyornis Newtoni
Genyornis newtoni was a gigantic, non-flying bird that lived in Australia during the Pleistocene Period. It is sometimes referred to as a 'thunder bird' due to its large size. Some information and pictures can be found here.