Bat Conservation International: Explore the world of bats through the articles, photos, and trivia

Butterflies and Moths of North America: Comprehensive guide to the Lepidoptera of the United States and northern Mexico, including a photographic identification guide, county checklists, and distribution maps

eNature.com: Resource and community for nature enthusiasts. Complete guide to over 4,800 North American plants and animals, with detailed descriptions and photographs, habitat guides, eCards, and newsletters