Lonnit, that's quite easy. This a female leopard. I just have to use all of my charm then I can get as close as an inch; next time, I shall try to stroke her head, perhaps she will gently start to purr ;-)
Back to reality. You would in fact be able to get as close as an inch or two because there is a thick pane of glass between the leopards and the visitors. But they never lay down near the pane, they are always in motion when they are in a short distance. Here, she was resting on a branch, about 10 to 15 ft. away.
Gerald