Well It happended with my tigers, jaguars, grizzly bears, All types of elephants, black leopard, snow leopard, cheetah, crocodiles, and polar bears. What they do is stand there roaring/trumpeting/bellowing/growling really loud and they don't move. So I checked their information panels and it said "Challenge grizzy bear 2" or "Challenge polar bear 24" or something else. I Go to look at grizzly bear 2 or polar bear 24 or something else, and there just walking around normal and fine, playing with toys and stuff. Yet the other animal keeps roaring/trumpeting/bellowing/growling really loud and they don't move. And theres one more mystery, why does it say "challenge grizzly bear 2" instead of "challenging grizzly bear 2"?