California, Woodhouse's, and Island scrub-jays are very similar but without white frosting on forehead, and with a more distinct white eyestripe. These species also live outside of Florida, and their ranges do not overlap with the Florida Scrub-Jay. Blue Jay has crest, is bright blue, black, and white, not muted blue, grayish white, and brown.
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Srubland Survivors: Read about Florida Scrub-Jays in Living Bird magazine.