Is that a Canon EF 600mm f/4 IS II USM Lens you are using?
Your backyard or nearby park likely has more potential photography subjects than you think. The Eastern Gray Squirrel is a very common animal subject that will, in some locales, tolerate humans. Get low to the ground to help throw the distracting background out of focus.
Camera and Lens Settings
600mm f/5.6 1/800s ISO 200 5760 x 3840px