When they did this, they found that the pits were clusteredexactly as might be expected ifthey were the result of animals deliberately aiming at each other.
这样操作后,他们发现凹坑聚集分布,正如人们假设的那样:是肿头龙故意用头部攻击彼此的结果。
Intriguingly, they found two patterns of clustering.
有意思的是,他们发现凹坑有两种聚集图案。
Those pachycephalosaurs with highly domed heads had pits on both the fronts and the backsof their skulls.
那些不太隆起的头骨仅在前方有凹坑,而非常高隆的则前后都有。
Those whose domes were lower had them only on the fronts.
这证明了两种肿头龙攻击时的不同。
This suggests the two sorts of animal fought in different ways. Low-domes, it seems, simplycharged at each other. High-domes did that too.
相对低隆的一种似乎仅向对方迎头冲撞。
But they also engaged in head-to-head wrestling of a sort that allowed them to get behindtheir opponents skulls and do damage from the rear, in the way that modern bison do.
非常高隆的肿头龙除此之外还会采取头对头式摔跤法:能够碰到对方头骨的背部,从后面对彼此造成损伤,好比如今的野牛。
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