TOEFL Reading: ETS-TOEFL阅读机经 - 2B1T53043U73TPR3L$

Paragraph 2 claims that yellow-rumped cacique colonies defend themselves from predators in all of the following ways EXCEPT: A. They establish colonies in hart-to-reach places. B. They physically attack invading predators. C. They hide active nests among previously used ones. D. They limit the size of their colonies so they are hard to find.