A red ball fell into the river, and two camel fish approached it, and they played happily. Meanwhile, a lively brown fish roamed the waters, clearing the river bed of weeds, and cleaning the waters of dirt. The brown fish finished its work, and ran towards its friends. The gray fish asked: What brought you? The brown fish replied with a smile: I came to play ball with you. The yellow fish shouted: Are you playing with us???!!! What a shameless fish! A beautiful story about marine animals, their characteristics and their role.