Here's an example of a grizzly expressing non-consent to being caged up: http://www.startribune.com/minnesota-zoo-bear-slams-rock-into-glass-pane-shattering-it

Here's an example of a grizzly expressing non-consent to being caged up: http://www.startribune.com/minnesota-zoo-bear-slams-rock-into-glass-pane-shattering-it-like-a-windshield/311777801/ http://www.startribune.com/minnesota-zoo-bear-slams-rock-int... That is sufficient for me and it should be sufficient for any decent human being. If you require a grizzly or an orca to "sign on the dotted line for informed legal consent", you are a monster, and you are the one who should be caged up.