I reached the tiger enclosure just as the keepers were hauling the meat up the feeding tree: so I waited until Kirana appeared and made light work of her task. I was lucky that the light was good and that I had time to choose my equipment and position - but it's a pity that I didn't get the focus quite right
Thank you both. It seemed the obvious thing to try to do. I'm slowly teaching myself more Photoshop skills (and I've kept a template in case I ever want to try this again).