One of the great frustrations of animal lovers comes down to how difficult it can be to know what they're thinking at certain times.
Sure, it's sometimes pretty obvious when one is really happy or under a great deal of suffering, but anyone who has ever been bitten by a dog wagging its tail knows it's not always so easy to read an animal's feelings. After all, they can't talk to us.
If they could, that would certainly make it easier to settle one debate taking place behind one of a British zoo's practices shown in the full video.