Learn
Why these introduced squirrels are here — how Americans built nature into their cities, and California inherited it.
Read the story →A growing visual reference of California tree squirrel photos — organized by species, with open-licensed images from iNaturalist.
Browse photos →Which of California's squirrels belong here, which were brought in, and why the distinction matters.
Native vs Introduced →Feeding, deterrents, attics, and what's legal when squirrels and people share space.
Living With Squirrels →Quick answers to the questions visitors ask most — myths, look-alikes, and common concerns.
Common Questions →Helpful guides and links — starting with what to do if you find a baby squirrel.
Resources →
The Bigger Story
California’s Eastern Gray and Fox Squirrels did not arrive by accident. Why are these introduced squirrels here? The surprising answer is a story about how Americans deliberately built nature into their cities — and how California inherited that invention.
Read the story →Looking for something specific? Identify a squirrel · Meet the species · Explore the map