They have hollow hair to keep warm in the winter. They roll in a pool of muddy water to avoid fly bites. They have keen hearing to sense danger in the forest. They use their wide hooves to prevent sinking in deep snow.
I gave my students this multiple choice question: How do moose use a learned behavior to protect themselves?

Only one answer is correct among these 4 choices:
- They have hollow hair to keep warm in the winter.
- They roll in a pool of muddy water to avoid fly bites.
- They have keen hearing to sense danger in the forest.
- They use their wide hooves to prevent sinking in deep snow.

Could you tell me which one is correct?

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