An illustrated twenty-volume reference set that contains over 500 alphabetically-arranged entries introducing animals, plants and habitats.

v.1. Aardvark-Baboon -- v.2. Bacteria-Bladderwort -- v.3. Bluebird-Chickadee -- v.4. Chimpanzee-Crane fly -- v.5. Cricket-Earwig -- v.6. Echidna-Flying fox -- v.7. Flying lemur-Grass -- v.8. Grasshopper-Horseshoe bat -- v.9. Horseshoe crab-Ladybug -- v.10. Lamprey-Maple -- v.11. Marlin-Muskrat -- v.12. Mustard-Oxpecker -- v.13. Palm-Polar bear -- v.14. Polar regions-Raven -- v.15. Ray-Sea lion -- v.16. Sea urchin-Sponge -- v.17. Spore-bearing plants-Termite -- v.18. Tern-Warbler -- v.19. Warthog-Zebra -- v.20. Index.