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BiologyBase (Popularity: ): Checklists, articles, and links for the world of life.
World Biodiversity Database (Popularity: ): A growing taxonomic database and information system that aims at documenting all presently known species (about 1.7 million). Taxonomic trees, descriptions, synonyms, literature citations, and molecular database queries.
BioImages - Virtual Fieldguide for UK Biodiversity (Popularity: ): Large selection of pictures of organisms, mostly British in origin. Images are an aid to identification, showing different stages, states and views of the organisms. Search the database or follow ...
Tree of Life (Popularity: ): Phylogenetic tree with information about the diversity of organisms on Earth, their history, and characteristics. An on-going multi-authored project hosted by the University of Arizona.
Natural Perspective (Popularity: ): Dedicated to the beauty and science of nature and to the joys nature brings to those who explore it. The material here is organized according to the biological principles of ...
Discover Life (Popularity: ): Information about taxonomy, natural history, distribution, abundance, and ecology of many species worldwide. Includes tools to identify, map, and database species.
ARKive (Popularity: ): Non-profit initiative of The Wildscreen Trust with photographs, movie clips, sound recordings, and brief desriptions of selected endangered and protected species of Britain and the rest of the world.
Natural Selection (Popularity: ): A gateway to quality, evaluated Internet resources in the natural world co-ordinated by The Natural History Museum, London.
Kingdoms Project (Popularity: ): Project to establish web-based databases of organisms and other natural sciences subjects. Includes information about some taxonomic groups.
Lepidoptera and Other Life Forms (Popularity: ): Taxonomic tree of mammals, insects, birds, and plants. Includes common and scientific names, publication details, references, links, general range maps, and some images. Most complete for Lepidoptera.
Canadian Version of Integrated Taxonomic Information System (Popularity: ): Searchable database of four kingdoms: plant, animal, fungi, monera. Search by scientific or common names, English or French.