MIT's Open Courseware's Biology pages provides lecture notes, lectures, images, textbooks, and other information to help students learning biology.
Darwin Online offers the complete works of Darwin and other information related to Charles Darwin.
DNA Interactive is a site with activities and information about DNA and genetics.
Encyclopedia of Life offers information on thousands of species.
Zoology Web Resources collected by U of Illinois Libraries.
Animal Diversity Web provides information on animal natural history, classification, distribution, and conservation and is maintained by the University of Michigan