The composition, the lighting, the detail ... perfect...and this wonderful creature makes for a favorite photo. It's as if you are waiting to see what will happen next... you are focused on the squirrel and what captures his attention. Excellent.
I have been thinking about the cropping suggestions. It is all relative as it depends on the purpose - for desktop wallpaper - no cropping, for a mini desktop - crop as much as anyone wants. Myself save it as it is and may use it as I think fit at any time or mood. HOWGH Thanks, dear Wendell. This one has the biggest eyes [particularly the right one LOL] reflecting almost all your camera and a part of your head, to say nothing about your big finger pressing the trigger ! LOL SAM & SAAB
Another stunning capture Wendell I love how the front of this photo is in shade and the squirrel is bathed in sunlight and again the lovely light in is or her eye.Stunning composition and great sharp details too.