Explores plant anatomy, taxonomy, and classification, from Monera through the higher plants. Includes descriptions as well as graphics and schematics.

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.

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.

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

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

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

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