雁过拔毛（雁過拔毛）　

◎ 雁过拔毛 yànguò-bámáo

[spare no effort in taking advantage of what one puts his hand on] 大雁飞过都要伸手拔几根毛,比喻凡是过手的事都要得些好处,绝不轻易放过