求各种鲸的有关数据资料（要英语），要简单的，比较适合小学生的短篇

求各种鲸的有关数据资料（要英语），要简单的，比较适合小学生的短篇

there are more than 80 kinds of whales in the world. and 30 kinds of them can be found in China. a small whale can be 6 meters long, and weighs 2000 kilograms. a bigger one can be 30 meters long and weighs 70 tons. the heartbeats of a whale in one mimute are only 9 to 10 times. all whales have a steady body temperature,36 degree. as the environment is getting worse, and killed by humans, the number of whales is decreasing rapidly. it's time for us to protect them, or they will disappear very soon！

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