Why Some Animals Evolved to Sacrifice Themselves动物为何舍身繁衍

A male musk ox can weigh up to 800 pounds and charge at speeds over 30 miles per hour. During the breeding season， these shaggy1， Arctic Circle behemoths crash into each other face-first and then stab their opponents with their huge， sharp horns.

一头雄性麝牛体重可达800磅，奔跑速度超过30英里/小时。（剩余7233字）