Piggley, Ferny and Dannan rescue an errant egg -- which they decide must be a dragon's egg. They hatch all kinds of plans to keep the egg safe, but when the creature inside emerges, it turns out to be a not-so-sweet wild swan chick. And that's when the real work begins. Lesson: Even though we may want to have a pet, sometimes the best place for that pet is in its natural environment (Responsibility/Pets) .