文档介绍：动物奇闻趣事
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A kangaroo cannot jump if its tail is lifted off the ground. It needs its tail for pushing off.
如果袋鼠的尾巴离开地面，袋鼠就跳不起来。它要靠尾巴推动才能离开地面。
According to tests made at the Institute (研究所) for the Study of Animal Problems in Washington, ., dogs and cats, like people, are either right-handed or left-handed, that is, these animals favor either their right or left paws (爪子).
华盛顿特区动物问题研究所的试验表明，狗和猫像人一样，也有右撇子和左撇子――即有些喜欢用右爪，有些喜欢用左爪。
Migrating (迁移的) geese fly in a V
formation (队列) to save energy. A goose’s wings flutter (扇动) the air and leave an air current behind. In the flying formation, each bird is in position to get a lift from the current left by the bird ahead. It is easier going for all, except the leader. During a migration, geese usually take turns in the leading position.
迁移中的大雁群成“V”字队形飞行是为了节省能量。一只大雁的翅膀扇动空气，在身后留下一股气流。在飞行队列中，每一只大雁都得到前面的雁产生的气流的升力。这样，除了领队以外，所有的雁飞起来都省力些。一次迁移飞行中往往有几只大雁轮流领飞。
An electric eel (电鳗) can produce electricity of more than 600 volts(伏), 3 times more powerful than a household outlet. It not only uses this power to kill its prey but to locate it as we