Plants
- Botany.com: Plant Encyclopedia to Identify Plants, Flowers, Trees & More
- Encyclopedia of Life
- FLORA OF NORTH AMERICA
- Home Gardening
- National Arboretum - USDA Plant Hardiness Zone Map
- National Gardening Association
- Native American Ethnobotany
- Plant Evolution Timeline
- Plant Information Online
- The PLANTS Database
- The Tree of Life Web Project
- Trees - Arbor Day Foundation
Animals
- Animal Diversity Web
- Electronic Zoo Animal Species
- Mammal Species of the World
- National Wildlife Federation
- Species 2000: Catalogue of LIfe
- Understanding Evolution
- Exploratorium: the museum of science, art and human perception
- Nature Online Video Streaming Archive
- Mammal Species of the World
- Encyclopedia of Life
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