- Diversity of Life Web Index
 - Information and lots of links to reviewed sites about taxonomy, phylogeney, and images showing the diversity of life on earth. - Integrated Taxonomic Information System (ITIS)
- Provides authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.
- Natural Perspective
- Introduction to, and celebration of, the diversity of life on our planet through pictures and text. Explore species through categories organised by taxonomy.
- NatureServe@
- Source for information about rare and endangered species and threatened ecosystems.
- Paleobiology Database, The
- Provides global, collection-based occurrence and taxonomic data for marine and terrestrial animals and plants of any geological age.
- Tree of Life Web Project
- Collaborative Internet project containing information about phylogeny and biodiversity.
- Web Lift to Taxa
- Complete listing of, and information about, taxa ranging from Archaea to viruses.
- World Species List
- Ever-evolving taxonomical database of plants, animals, and microbes.
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