The eNature.com Online Field Guide is a searchable database for identifying more than 4,000 plant and animal species of North America. Additional species and other nature content are constantly added to the database.
A terrific invertebrate diversity exploration based in the California Bay Area. The site has lots of excellent tools for identifying and learning about invertebrates, ideas for curricula, kids activities, and an 'ask an expert' link. Good site for kids and adults. (Insect identification tools are best for California, but there is lots of other information here too.)
An online archive containing picture, movie, and sound files of a wide variety of animal species.
A database of images, free for educational uses.
A database of animal images, free for educational uses.
A link to some whale sounds.
An online guide for North American mammal tracks.
Animal Tracking Guide (for kids)
A guide to tracking animals, including observation skills, sign, and advanced tracking concepts.