【明報專訊】It is late spring down at the duck farm and the ducklings are swimming happily in the pond, waddling（蹣跚）about the yard, scurrying here and there in the grass enjoying the warm weather. The air is filled with excited quacking and a flurry of downy feathers. Many wild birds are also busily gathering food — seeds, berries, insects — to feed their nestlings. They called down to the ducklings, "Well, little ducks, you sure do seem to have an easy life! Just playing all day with not a care in the world（無憂無慮）. Don't you need to work on your flying or catch grubs and worms?"