"Mother-cat" – it's incredibly touching story for children. She talks about how fat the cat port to Sorbas had to become a mother for the young seagulls. It would seem, lazy and sybaritic cat – not a very suitable choice for coach of the Hatchling. But the destiny has disposed so that straight to his favorite pillow fell from heaven Kanga Seagull caught in an oil slick. Kanga, dying, manages to lay an egg and takes Sorbas three promises, the most difficult of which is to teach the chick to fly. How to Sorbas and his friends-cats will be able to perform such incredible promise?