I could just image someone shouting "Step Away from the Buffet!" when I came across the fattest cow I have ever seen in my life, grazing some Colorado high country free range in early autumn. My aiming at her with my Canon EOS 7D MarkII with Sigma DG 150-500 IS didn't stop her from munching - not for a moment. 1/800th second, f/8, ISO 1600. Simple adjustments in Lightroom.