Large body size for winning and large swords for winning quickly in swordtail males, Xiphophorus helleri
Large body size for winning and large swords for winning quickly in swordtail males, Xiphophorus helleri
复制标题
剑尾雄性剑尾鱼的体型较大，有利于获胜，剑较大，可以快速获胜
作者：
John Prenter;P. Taylor;R. W. Elwood
