Bedtime stories of dung beetles and cockroaches.

Dung beetles rolled around with a dung ball, and the cockroaches on one side kept laughing. The cockroach said, "Look-look-how dirty it is! You dung beetles live by eating feces, and you eat animal feces every day. It's disgusting. "

Dung beetles was a little unhappy when he heard the cockroach say this. He shouted at the cockroach, "You cockroaches are no better. You eat human leftovers and live in a dirty place. Garbage is your food. People chase you everywhere when they see you, which shows how annoying you are. "

The cockroach said angrily, "You are the dirtiest in the world."

Dung beetles said, "You should."

A fly flew over and heard their conversation, which made the fly laugh. The fly said, "You are both the dirtiest."

Dung beetles and cockroaches looked at the watching flies and said, "You should be the dirtiest animal. You spread bacteria everywhere. "

Say that finish, dung beetles and cockroaches began to work.