For the North American musk oxen, this is rutting season.

对北美说，这正是求偶季节。

At summer's end, male bison help to move the sun-baked soil as the rutting season starts.

夏末，随着发情期开始，雄性公也开始帮助翻动太阳晒过土。

But we can be much more specific than this even, because we're clearly looking at these animals in the autumn, at the time of rutting and migration to winter pastures.

我们还可以更进一步地具体描绘，显然我们观察到，是秋天时向冬季牧地进行大迁移。

They had grabbed each other by the shoulders and were carrying out a Staring Contest, the horns on their helmets locked together like a couple of rutting stags.

他们抓住彼此肩膀，正在进行一场凝视比赛，他们头盔上角紧紧地锁在一起，就像两只公。