Instructions
First look at the bird's shape and size. An adult scrub jay should be about a foot long from beak to tail feathers. These tail feathers are loose and often appear as if they're about to fall out. They are typically larger in scale than the average songbird or blue jay, though they are identical in shape.
Look at the bird's coloring. They are blue on their back and wings in the same spots as a blue jay, though the shade of blue is often much lighter with a slight hint of grey. The best description is a powder blue. The forehead is a light grey strip and the throat is plain white. Their beaks and feet are black and the feathers along the legs leading up to the feet are grey.
Listen to the bird's call. If you're still unsure of whether you're looking at a blue jay or a scrub jay, their calls will always reveal the difference. A blue jay is a song bird that whistles and tweets pleasantly. A scrub jay's call is more akin to the dry harsh croak of a crow. Their calls are grating and discordant. If the bird matches these criteria then you're looking at a scrub jay, which is an endangered animal and is quickly losing its natural habitats to mankind. Consider yourself lucky to have seen this beautiful and increasingly rare bird.
How to Identify a Scrub jay
The scrub jay is a close relative to the blue jay and looks similar, though their behavior and choice of habitat are somewhat different. What was once a single species has been divided into three subspecies: the Florida scrub jay, the Western scrub jay and the Island scrub jay. The only reason for this is they live in very different parts of North America, though they look and act exactly the same.