All Organisms (Plants, Animals, Fungi)

• iNaturalist Site for posting observations from around the world, and for getting help with identifications of plants and animals you have observed.
• iSpot Nature A friendly and free community helping to identify wildlife and share nature. Especially strong European coverage.

California Plants

• The California Native Plant Society (CNPS) has many local chapters whose volunteers may be able to help you identify a plant you found growing in the wild.
• California Native Plant Society Facebook Group provides help with California plant identification.
• Calflora Information on wild California plants.
• Calflora Plant ID Help
• Jepson Online Interchange for California Floristics Index to California plant names.
• California Consortium of Herbaria serves as a gateway to information from California vascular plant specimens that are housed in participant herbaria.

North American Insects & Spiders

• BugGuide A volunteer-run resource that allows registered users to upload photos of a North American insects for identification
• UC Berkeley BioKeys A simple key for identifying an insect to order.
• Common Spiders in California A page of photos and text maintained by UC Berkeley grad student Steve Lew.