The little red tractor chugs along the fence.

Each fence post has a number. "One, two, three!" counts Spike.

"Four, five, six!" counts Suzy.

Chug, chug! "Seven, eight, nine," counts Little Thunder, very slowly and carefully.

Uh-oh. A post is missing!

"What comes after nine?" asks Suzy.

"Ten!" says Little Thunder. He puts a new post in the gap.

Chug, chug, chug! The tractor drives all the way home. Toot, toot!