"What is this?" asks Little Thunder. He holds a soft, fluffy ball.

"That is wool," says Suzy. "It comes from sheep!"

"Sheep grow a big woolly coat," says Spike. "In spring, the farmer gives them a haircut."

"Does it hurt?" asks Little Thunder.

"No! It is like your hair getting cut," says Suzy.

The wool is spun into yarn. Then it is knitted into a warm jumper.

"Thank you, sheep!" says Little Thunder.