小学6年级 - 记叙文 - 叙事 阅读指导

Hello!!!!! I am a head of fat fat, fat fin whales. People say that like is the largest animal, that is wrong, the biggest of the animal is actually I-whale. At present our biggest whales of about one hundred and sixty thousand kilograms, also is one hundred and sixty tons, light tongue over a dozen pig head so heavy.
A long time ago, we and cattle and sheep's ancestry life on land, but later environment changed, our ancestors lived in the shallow sea of closer to land, then our ancestors limbs completely degradation, grew up to the whole body into a fins, the fish, the way to adapt to the sea life. So we are not a fish, but a mammal.
We are divided into two categories, the whale is a whale no teeth, a ?