If an ancient animal had structures that looked like antlers, palaeontologists would argue that it probably used them as an elk or moose.

如果一种古代动物有看起来像鹿角的结构，古生物学家就会争论说它可能像麋鹿或驼鹿那样使用鹿角。

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Some of its fossils are so well preserved that scientists can see traces of cell structures that contained pigments. The finding led to colorful views of the cat-size animal, down to its striped tail.

中华龙鸟化石的某些部分保存十分完好，科学家们甚至发现了包含色素的细胞结构，他们认为这种猫类大小的史前动物是彩色的，甚至还拥有一条带条纹的尾巴

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Circular tents from Malta, Siberia. These animal hide covered structures were bolstered with stones at the base.

西伯利亚Malta的圆形帐篷，上部由兽皮覆盖，下部由石头固定。

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The researchers first showed that structures on the animal's head were probably sensory organs, then found it could detect electric fields in water.

BBC: Dolphin hunts with electric sense

"If you understand the distribution of these structures in the skin of a prey animal, you can understand something about predator-prey interactions, and it might explain some of the hadrosaur fossils we see with these bite marks, " he said.

BBC: Dinosaur mummy yields its secrets