So I was looking at this picture. It shows a big troupe of mostly African animals all walking along the savanna together. I think it was meant to be sort of an idyllic scene, but there are really all kinds of animals - tigers, giraffes, lions, gazelles, etc. - just walking together, not eating each other or anything. Every time I look at it, despite the pleasant-looking scene, I think of some horrible catastrophe. Why would all those animals be moving in one herd unless they're running away from a volcano or a fire or something?