Earthquakes are a good sign for a Tsunami. I should imagine the majority of animals hear the calls and see the body languages of other species. The message gets passed along. Obviously they don't hear "a tsunami is coming" but they know 'something' is wrong and will react on it. It's all pretty simple really.
Maybe because god backwards is dog. I think all of the dogs on earth are gods! that's why in the dark their eyes glow in the dark, they have powers, it all makes sense now!
Simple answer: Animals don't care about Jerry Springer, Obama-mania, or any other bullshit. The ancients Egyptians, Mayans, Sumatrans, Chinese, etc etc... they all warned us by writing these things down or carving in stone with a simple message... RESPECT THE EARTH AND NATURE. This planet will fuck up itself and the people on it quicker than we could ever imagine. Always has, always will. But yet more people pay more attention to their I-phone than what really happens around them.