I was speaking not long ago to a dispatcher who used to work for a cargo company at LHR.
B744F came on stand and the loaders opened one of the hold doors, and low and behold there stands a tiger, which had managed to escape its cage.
Needless to say, they closed the door asap! After a few times of opening and closing the doors for a look, the tiger wandered over to its cage and lay down. I don't envy the poor guy who had to leg it in and close the cage!