고등영어 시사(한) 2과 본문 mp3

Lesson 2 Cooperation in the Animal Kingdom

FISH

Fish also cooperate.

As everyone knows, big fish often eat little fish.

Sometimes, however, little fish help the big fish, so the big fish do not eat the little fish.

Tiny fish, which scientists refer to as “cleaners,” swim into the mouths of bigger fish, which are referred to as “clients.”

The cleaners eat parasites in the clients’ mouths.

After the cleaners do their job, the clients let them go, instead of swallowing them.

The cleaners get a meal, and the clients get a healthier mouth.

Sometimes the cleaner fish chew on the wall of the client fish’s mouth.

Although this may cause pain, the big fish still do not eat the little ones for two reasons.

First, the cleaners are too small to satisfy their hunger.

Second, it is hard to find good cleaners.

Once the cleaners and the clients establish trust, the clients want to cooperate with the cleaners and keep them around.