'Boo' doesn't know he's captive! He lives in a Brown Bear centre for orphans, and has 25 acres to wander in, and looks after himself - the keepers only provide food if his enclosure is looking barren, and then food is dropped in from the ski lift so he doesn't get used to being fed by people. He normally mooches around in the bushes, but we were incredibly lucky that he came to say hello.
This was taken about 0.3 seconds before a snarling mock charge happened - close enough for me to a grumpy Grizzly!!
1/320 sec at f/5.6, ISO400