Let's look at this from another angle: At the same time and place, ducks are leisurely floating, while geese are fleeing for their lives. Can it be that of the two birds only the geese are considered worthy targets for heroes 'arrows?
大膽換個角度看，一天、一地，野鴨如此優哉，大雁卻要逃命，會不會是大雁才足以配英雄豪傑？