Snakes of the world

Butterflies of Costa Rica

In the Rainforest by Catherine Caulfield

Tropical Nature by Forsythe and Miyata (strongly recommended)

Cost Rican Natural History by Janun

In Quest of the Unicorn Bird by Oliver Greenfield (my brother) - ISBN 0-7181-3561-X
(Nominated for Sunday Times / Dillons Young Writer of the Year 1992)