* Simple Subject: The main noun or pronoun that performs the action of the verb.
In the phrase "a bushy tail," there is no verb and no action being performed. It's simply a descriptive phrase.
Therefore, it's not a complete sentence and doesn't have a simple subject.
To make this into a sentence, you would need to add a verb and possibly a complete thought, like:
* "The fox has a bushy tail."
* "A bushy tail swished through the grass."