John: What are you watching?

Ethan: A video about butterflies.

John: Boring! Let's go outside and have fun.

Ethan: Don't say that. Taiwan is home to over 400 kinds of butterflies.

We live on this island, so we should learn more about them.

Nora: Then what did you learn from the video?

Ethan: Each year, millions of purple crow butterflies fly across National Highway No. 3.

Look! What an amazing sight!

Nora: I've heard of this! When they cross the highway, many of them are killed by the traffic.

Ethan: That's true. Now four-meter high nets are set up to stop these butterflies from entering the traffic flow.

Nora: But where are the butterflies going?

Ethan: They're going to the north, and in autumn, they will fly back to spend their winter in the south.

John: Sounds interesting. I didn't know butterflies could live through the winter.

Ethan: I'm planning a trip to see the butterflies. Want to join me?

Nora: Sure.

John: Count us in.