The story of a seagull and the cat who taught her to fly

A 1001 CBYMRBYGU. A group of cats encounter a seagull who has run into an oil slick. The gull is gravely ill and begs the cats to promise to care for the last egg she has laid and to teach the baby gull to fly. The cats promise. It is more difficult to teach a bird to fly than the cats realized, but they try to remain true to their promise.