Squirrel

@Emilio Garcia: Thank you, Emilio. In theory, my Sigma 18-200 mm optical stabiliser zoom is no match for prime lenses and some high quality shorter zooms. In practice, though, it does very well. (Photoshop's Smart Sharpen also used here.)

@Scott Rippee: Thanks, Scott. I'm open to any suggestions. In this case, I used the levels control in Photoshop to heighten the contrast between the squirrel and the background as much as possible.

@Ken McCoy: Thanks, Ken. That image you have of me in this case is quite a funny one when you combine it with the alert look that the squirrel has! Alas, it wasn't so. This is cropped from the long end of my zoom, which is equivalent to 300mm in 35mm format.