In other words, having only one type of fossil is often not enough to draw definitive conclusions about an ancient species' behavior.
换句话说，要对某种古代物种的行为得出明确的结论，只有一种类型的的化石是远远不够的。
That makes the duo the oldest known fossil evidence of hitch-hiking behavior, or phoresy, in a large group of mites called the Astigmata.
这个“二人组”就成了已知最古老的化石证据，来支持无气门亚目一类螨虫的搭便车现象，或称寄载现象。
The fossil find shows some modern animal behavior has very old roots, Sereno said.
Sereno说这次化石的发现显示了一些现代的动物行为能追溯到远古时期。
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