Given the task definition and input, reply with output. In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

Sentence: They roll in a pool of muddy water to avoid fly bites do moose use a learned behavior to protect themselves. Question: How do moose use a learned behavior to protect themselves?

They roll in a pool of muddy water to avoid fly bites.