High above the sleepy hills, Nimbus the baby dragon lived in a cosy castle made of soft, white clouds.

He was only the size of a little cat, with fluffy blue scales and tiny, stubby wings.

Nimbus had a very special secret. Whenever he gasped or giggled, he did not breathe hot fire.

Instead, he breathed out beautiful, glowing mini-rainbows that floated in the air like bubbles.