Here's why:
* Common Noun: It refers to a general group of people, animals, or plants living in a particular place, usually under a common rule or authority.
* Example: "The ants formed a colony in the garden."
* Collective Noun: It represents a group of individuals considered as a single unit.
* Example: "The colony was founded by settlers from Europe."
In the first example, "colony" refers to the group of ants. In the second, it represents the whole group of people living together in a specific location.