Why does the little squirrel have a big tail?

1, the squirrel's tail is folded like a broom, which can sweep the floor.

Squirrels can open their tails like parachutes and land safely.

Squirrel's tail is inclined, like a small sail, which can help swimming.

Squirrel's tail is covered on the body, like a quilt, which can keep out the cold and keep warm.

Recently, scientists found that squirrels use the change of wagging their tails as their "language" for communication.