Picture of the Day: The Standoff
In this fantastic close up by Alessandro Cancian, we see a chipmunk and bird facing off, both clearly interested in the food that is atop this post. In the photo description page on 500px, Cancian says he used a telephoto lens with a focal length of 420 mm, so he was definitely a fair distance away. Talk about great timing!
Additional photo details: Shutter speed 1/1000, Aperture f/5.6, ISO 400. Taken with a Nikon D3S.