This pic is a 28 image series shot at f/2.8.
Good shot, I do hope the animal wasn't dead (i.e. killed by you) though :-o ... note that at this rate you'll burn your shutter in no time, personally I use my 60d for stacking (deeper dof) and for the 6d use at least f5.6-f8 as you need less stacks, the iq/sharpness is better and the background blur isn't that different from wide open.