Blending In

This sycamore tree is located in a playground/picnic area located just a couple hundred yards from our front door. For each of the last three years, we've been treated to barred owls nesting in this tree. Believe me when I say that the owls blend right into the tree. Often I'll be shooting an owl with my camera and lens on a tripod and people will come up and ask me what I am photographing. When I say "the baby owl in the tree," they will look at the tree and look back at me like I am crazy. I then will tell them where specifically to look in the tree, and when they finally see it, they will often comment about how much it blends in. This is particularly true if you are looking directly at it when it is tucked in the hole in the tree. In this side view and light, it's more visible, but it still looks from a distance like a bump or knob in the tree, and most people walk right by and never notice it. The nest is about 20 feet off the ground. This image was taken with my old manual nikon 500 f4.0 while standing on a nearby picnic table. I left it uncropped to include more of the tree for this challenge theme. For purposes of the challenge, I also like that the juvenile is asleep without a care in the world, as if no one can even see him.  D600, 500 nikon f4 manual at f4, iso 500, 1/640, full frame (May, 2017). Suggestions and other comments welcome.