I had the unique opportunity (a while ago) to visit an educational wildlife facility in Melrose, FL. The founder of the organization graciously took several hours show off and educate my journalist friend and I about his incredible animals, and he allowed me to sketch his big cats up close as they went about their business.
Two Bengal tigers, a Siberian tiger and a lioness made it into the sketches, mostly during feeding time. They were moving a little too quickly the rest of the time!
The place has a website, replete with millions of adorable photos. www.singlevisioninc.org