所以，长着四角眼的动物由于其巨大的瞳孔在白天能紧密的闭合在一起阻挡光线使得它们在晚上有很好的分辨力。

Consequently, animals with rectangular eyes can see better at night due to having larger pupils that can be closed more tightly during the day to restrict light.

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在波兰东南部的圣十字山的一座废弃的采石场，（科学家）曾发现过动物脚印的化石，经鉴定，为3.95亿年前形成，比发现的最古老的四角龙（一种拥有四肢而非鳍的脊椎动物）化石要早1.8亿年。

In early January 2010, another group of scientists found the oldest fossilized footprints made by a four-legged creature

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