Caleb is silly. What are two examples of how he acts silly?

From the text:

"Woolly ragwort! " Caleb whooped. He made up a song.

"Woolly ragwort all around,

Woolly ragwort on the ground.

Woolly ragwort grows and grows,

Woolly ragwort in your nose."

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Caleb stood up and ran like the wind, and the sheep an after him. Sarah and I watched him jump over rock and gullies, the sheep behind him, stiff legged and fast. He circled the field, the sun making the top of his hair golden. He collapsed next to Sarah, and the lambs pushed their wet noses into us.