Geologists often know where earthquakes will occur. Sometimes they even know how significant they will be. But it is still almost impossible to predict when they will occur. Some people think that animals can tell that an earthquake struck the city of Haicheng, in China. A few weeks prior to the earthquake, animals in the area had begun behaving strangely. Geologists were already expecting an earthquake so they told the people who lived in the city to evaluate. Scientists are now doing research on whether animal behavior can help predict earthquakes.