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colony


a group of animals or plants living in one place

A colony of flamingos flocks together on a lake.

population


all the members of one species in a particular area

With more than 35 million residents, Tokyo, Japan has the largest population of any city.

breeding pair


a pair of animals that raise offspring together

The breeding pair of wolves in an arctic wolf pack has a litter of pups every year.

census


an official count

During the zoo census, zookeepers carefully count penguins.

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