Here's why:
* Colons introduce lists: Colons are used to introduce a list of items, phrases, or sentences that directly follow the colon. "Including" already implies a list, so the colon becomes redundant.
Example:
* Correct: The store sells a variety of fruits, including apples, oranges, and bananas.
* Incorrect: The store sells a variety of fruits: including apples, oranges, and bananas.
When to use a colon with a list:
* After an introductory phrase or sentence that sets up the list.
* When the list is a complete sentence or a series of complete sentences.
Example:
* Correct: The store sells a variety of fruits: apples, oranges, bananas, and berries.
* Correct: We have a lot to do today: first, we'll go grocery shopping; then, we'll clean the house; and finally, we'll relax and watch a movie.
Remember, "including" is already an indicator of a list, so a colon isn't needed.