Arkive
Images and descriptions of animals, plants and fungi. Includes endangered species from Britain and worldwide.

British Big Cats Society
Presents the evidence for big cats in Britain, and provides information about sightings and species identification.

MarLIN
The Marine Life Information Network provides information about marine species and environments. Includes details of species, habitats, how to record sightings, publications, and services provided by MarLIN.

UK Moths
A guide to the moths of the British Isles. Includes moth descriptions and pictures, book reviews, and a thumbnail search.