在研究中，珀拉德和他的同事丹尼尔·布鲁姆斯坦(Daneil Blumstein)检视了八种不同种类的啮齿动物，它们生活的社会群体的大小和复杂程度各异。
For the study, Pollard and colleague Daniel Blumstein examined eight different species of rodents that live in social groups of different sizes and complexities.
在每个种类中，船是按型号和大小来排序的。
In each category, ships are organized by ship type and size class.
在首层，参观各种形状和大小的填充物的动物和种类。
On the first floor, visit with stuffed animals of all shapes, sizes and species.
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