Biology: Dictionaries & encyclopedias

The Biodiversity Heritage Library improves research methodology by collaboratively making biodiversity literature openly available to the world as part of a global biodiversity community.

The Encyclopedia of Life (EOL) is a free online resource bringing together information about all life on Earth including text, images, video, sounds, maps, classifications and more.

eLS features over 5,000 specially commissioned, peer-reviewed and citable articles in the life sciences and is an essential resource for students. Topic browse spanning the life sciences from cell biology to ecology.

Grzmek's includes authoritative peer-reviewed content on more than 4,000 species categorized by Amphibians, Reptiles and Birds, Fish, Insects, Mammals and Simple Aquatic Life, including information on evolution, habitat, behavior, range and more.

This version of The Canadian Encyclopedia, released in enhanced digital interactive form in October 2013, represents the latest incarnation of a project with a unique history.

An exhaustive dictionary of over 13,000 terms relating to invertebrate zoology, including etymologies, word derivations and taxonomic classification. Entries cover parasitology, nematology, marine invertebrates, insects, and anatomy, biology, and reproductive processes.

The most comprehensive dictionary of the English language ever produced. Includes definitions, quotations, and full etymologies. All are searchable.