Marine and Aquatic Sciences 

Aims to index every natural history collection on earth.

From the California Department of Fish and Game.

Free life sciences information from Thomson Reuters.

"taxonomic information, images, records of collections, and references pertaining to diatoms."

Online field guides.

Open access biodiversity data.

"taxonomic information on plants, animals, fungi, and microbes of North America and the world."

From the International Union for Conservation of Nature.

Good resource for students.

"Broad, collaborative program to provide increased access to data and information on the nation's biological resources."

Website for students on on "genetics, the study of evolution, variation, and the rich complexity of living organisms." Produced by Nature Publishing Group.

Information on "biodiversity, the characteristics of different groups of organisms, and their evolutionary history (phylogeny)."

Biology resources from the United States Geological Survey.