Scientists should spend more time observing animal behavior to predict natural disasters rather than investing in expensive equipment. In 1970, Chinese scientists noticed farm animals behaving strangely before an earthquake, allowing them to evacuate a city and save thousands. Japanese scientists also found that catfish become more active before moderately strong quakes. While humans cannot detect subtle changes in the earth's magnetic field before quakes, some animals appear sensitive to these changes. Scientists now want to determine which animals are affected to help save more lives in the future.