Ducks take only three months to hatch their eggs and rear their young. The hatchlings are "mature" at birth: they can walk as soon as they are hatched, and they only take a month to grow up. In the short space of a season the ducks complete their mission of producing the next generation, and almost immediately leave again for the south.
野鴨花三個月孵育，小鴨是「早熟型」寶寶，出世即能行走、長大只要一個月，短短一季，匆匆辦完煙火相續的任務，即刻又要南去。