The City Nature Challenge is an annual competition that mobilizes communities to document as many species of plant, animal and other types of critters in a four-day period using the iNaturalist app.
The City Nature Challenge began as a friendly rivalry between LA and San Francisco. Now millions of people globally are helping biologists by taking photos of their local plants and animals.
In LA, more than 2500 species were identified by about 1400 observers in this year’s City Nature Challenge. The western fence lizard was the most observed species.