World Heritage Bridges - from Roman to present times
http://www.icomos.org/studies/bridges.htm

International Council on Monuments and Sites
http://www.icomos.org/

A Span For All Seasons - mostly suspension bridges, by David Denenberg
http://www.bridgemeister.com/

Animal Planet
http://animal.discovery.com/

Animal Planet: Future is Wild
http://animal.discovery.com/convergence/futureiswild/futureiswild.html

Natural History of North America
http://www.nearctica.com/index.htm

Human Nature Review is a significant source of analysis
and commentary for readers at leading universities and
research institutes in over one hundred and sixty countries.
http://human-nature.com/

Darwin and Darwinism; Evolutionary Psychology
http://human-nature.com/darwin/