《资治通鉴·梁纪·梁纪一》
永光年间，有人进献了一只长角的公鸡，刘向认为： 鸡是小家禽，其职责是到时鸣叫，唤醒主人起床，这是地位低贱的下臣掌权当政的征兆。
永光中，有献雄鸡生角，刘向以为 鸡者小畜，主司时起居人，小臣执事为政之象也。
During the Yongguang reign, someone presented a rooster with horns. Liu Xiang saw this as: “Chickens are small domestic birds whose duty is to crow to wake up their owners. This is an omen that a low ranking subject will take power and govern the country.” 