他们的研究对象是草原田鼠，一种终生交配的小型啮齿动物。
Their study was conducted in the prairie vole, a small rodent that mates for life.
对于那些不熟悉可爱的草原田鼠的人来说，这是一种在北美中部草原上发现的小型啮齿动物。
For those unfamiliar with the delightful prairie vole, it is a small rodent found in the grasslands of central North America.
以猎捕小型啮齿动物，野兔，雪兔，野鸭和野鹅为食。
It hunts and prey on small rodents, rabbits, hares, ducks and geese.
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