Ruminate means to chew something over (either figuratively or literally), and this White-tailed Deer seems to be doing both. If you look closely you can see that there is one piece of grass still sticking out of his mouth, also the way that he is looking out over the water, it looks like he is pondering something.
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Taken: July 1, 2014
Location: South of Calgary, Alberta
Camera: Canon EOS-1D X
Lens: Canon EF200-400mm f/4L IS USM
Focal Length: 376mm