英語長文演習(基礎) 〔９. 動物の地震予知能力〕 Animals often seem to know that an earthquake is coming. Before a Chinese quake in 1975 snakes awoke from their winter sleep earlier, but died in the cold air. Cows tried to escape from their houses. Some other animals also acted so strangely that Chinese scientists thought that a quake was coming. They moved people away from the danger area and saved thousands of lives. How do animals know when an earthquake is coming? Some scientists once took a group of dogs to a place where a series of very weak earthquakes was happening. Several small quakes were often coming before or after a large one. Before each quake a low booming sound was heard. Each boom made the dogs bark wildly. Then the dogs began to bark even when they could not hear anything. One of the scientists who was recording the quakes looked at his machine. It was reacting to a booming sound. The dogs heard it I They also felt the weak quakes that followed it. The machine recorded both, though humans felt and heard nothing. Not every animal feels the danger of an earthquake. Just before a California quake in 1977, for example, an Arabian horse got very excited and tried to run out of his house. But the horse next to him stayed quiet. Discovering what animals feel, and leaning how they know it is a danger signal, will be a job for future scientists.