The passenger pigeon(旅鸽) used to be one of the most common birds on the earth. A century ago, they became extinct(灭绝的). Scientist Ben Novak is working to bring the birds back. Here, he explains to us why we should bring passenger pigeons back from extinction.

    The passenger pigeon is not the bird that you probably know. It's been gone from the world for 100 years. It means that few living people have ever seen one flying in the sky.

    The passenger pigeon lived differently from other birds in America-in flocks(群) made up of millions of birds. They darkened the sky when they flew in the air. One reason to bring passenger pigeons back to life is that it would be wonderful to see a flock that big. It would also be cool to see an extinct animal.

    But it's not just about doing something cool. Huge flocks of passenger pigeons played a key role in shaping forests. The weight of so many birds resting in the trees

broke many branches(树枝). This allowed more sunlight to reach the forest floor, which helped more plants grow.

    The birds also ate a large number of plants. That influenced which trees to grow in the forest. If we bring back the passenger pigeon, it would play an important role in shaping forests once again.

— Yeah! I like the movie, too. It's so __________________.

    Where is the best place to see animals? The answer is Australia. There are many cute animals there. The koala is one of them. Koalas like to sleep. They often sleep in the day, but at night they often get up and eat leaves. There is another animal. They can't run but they can jump. They only live in Australia. They have pockets in front of them and they put their babies there. What are they? They are kangaroos.

    It is summer. An ant(蚂蚁) works all day long. Now she is carrying some cake to her home near a big tree.  He says to the ant, "How do you do, Ant? Why are you working so hard today? Look! It's warm and fine. Have a rest. Come and play together." But the ant says, "No, I have to work. Winter will come and it will be cold. "

    "You can work in autumn too. I sing every day. How happy I am!"

    Summer and autumn go. Now winter comes.  The cicada doesn't have any food. So he goes to the ant's house.

A. The sun is good and the sky is blue.

B. There is snow everywhere.

C. A cicada(蝉) is in the tree.

D. The ant wants to give some food to her friend.

E. Where can I get the food then?

She likes music her sister .

will be short people will have long holidays.