Searchable and browsable taxonomy tree of organisms for which there are publicly available gene sequences.

Includes the Index to Organism Names, a publicly available subset of TRITON the Taxonomy Resource, and the Zoological Record Thesaurus.

Provides access to materials from the fish, mammal, and fungus collections of the University of Michigan, USA. Includes many images of specimens.

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

A compilation of various phylogenetic trees representing different views of taxonomy. Includes links to other taxonomic websites.

Wikimedia Foundation project that aims to catalog all species.

Non-profit initiative of The Wildscreen Trust with photographs, movie clips, sound recordings, and brief descriptions of selected endangered and protected species of Britain and the rest of the world.

Classification of all forms of life, with some photos. Has a strong South African emphasis.

Taxonomic tree of plants and animals with a photo gallery and some checklists for the Czech Republic and Slovakia. In Czech and English.

A global network of researchers engaged in a ten-year initiative to assess and explain the past, present, and future diversity, distribution, and abundance of marine life in the oceans.

Information about taxonomy, natural history, distribution, abundance, and ecology of many species worldwide. Includes tools to identify, map, and database species.

A gateway to quality, evaluated Internet resources in the natural world co-ordinated by The Natural History Museum, London.

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.

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.

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 a taxonomic tree.

Checklists, articles, and links for the world of life.

Provides comprehensive information about the aquatic habitats, animals, and plants of this country.

Searchable database of four kingdoms: plant, animal, fungi, monera. Search by scientific or common names, English or French.

Information on the plants, animals, and fossils of Ireland. Includes an encyclopedia of marine life of the UK. From the Ulster Museum Sciences Division.

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.