Once upon a time, in a small village tucked against the edge of a great forest, there lived a boy named Timmy. Timmy loved dinosaurs. He loved all of them, but most of all he loved the Ankylosaurus, with its heavy armour plates and the enormous bony club on the end of its tail.

His room showed it. There were dinosaur books stacked three deep on the shelf, dinosaur models lined up along the windowsill in careful order of size, and posters covering so much of the wall that you could barely tell what colour the paint underneath was. Timmy would spend whole afternoons lying on his floor, imagining himself striding out on adventures beside those ancient giants.

His favourite thing in all the world was telling the villagers what he knew. Unfortunately, his telling had a habit of turning into mischief.

He would come tearing down the lane with his arms waving above his head, shouting at the top of his voice.

“ANKYLOSAURUS! Ankylosaurus is coming!”

And the villagers would drop their baskets and their brooms and come running — the baker still dusted white to the elbows, the blacksmith with his tongs still in his hand — only to find Timmy doubled over with laughter, pointing at their startled faces.

The first time, everyone laughed along with him.

The fourth time, nobody laughed at all.

“Timmy,” said the miller’s wife, folding her arms, “one of these days something will really happen, and not a soul in this village will believe you.”

But Timmy could never resist for long. One sunny afternoon he ran into the village square, waving both arms and hollering.

“Ankylosaurus! There’s an Ankylosaurus in the forest!”

Not one person looked up.

“That’s just Timmy again,” someone muttered, and they went back to their work without so much as a glance.

Timmy trudged home with his hands in his pockets, feeling rather flat. His best prank had gone stale.

The next morning he decided to explore the forest properly. With his most trusted dinosaur book tucked under his arm, he wandered further in than he had ever gone before — past the woodpile, past the old stone marker, past the place where the path gave up and became nothing but moss and ferns. As he walked he imagined an Ankylosaurus stamping through the undergrowth, its tail swinging, its armour catching the light in bright green flashes.

Then he heard something behind him.

Rustle. CRACK.

Timmy turned round, and his book slid out from under his arm and landed with a soft thump in the leaves.

There, standing in a clearing not twenty paces away, was a huge creature with a low, heavy, armoured body and a club-like tail resting on the ground behind it. It lifted its head and looked at him with a calm brown eye, and went on chewing.

It was an Ankylosaurus. A real one.

Timmy’s mouth fell open. He wanted, more than he had ever wanted anything, to show somebody. He turned and ran the whole way back to the village, branches whipping past his face, shouting until his throat burned.

“Ankylosaurus! ANKYLOSAURUS! There’s really an Ankylosaurus in the forest!”

But the villagers only smiled and carried on with what they were doing.

“Nice try, Timmy,” said the baker, not even turning round. “We shan’t fall for that one again.”

“No — please — it’s true this time!” Timmy’s voice cracked. “You have to believe me!”

Something in the way he said it made an old man named Mr Thompson set down his rake and look at him properly. Timmy’s face was white, and his hands were shaking, and he had leaves in his hair.

“All right, lad,” Mr Thompson said kindly. “Show me where you saw it.”

So Timmy led him back into the forest, with three or four curious villagers trailing behind, expecting nothing at all.

And there in the clearing, exactly where he had left it, the magnificent Ankylosaurus stood grazing peacefully in the dappled light.

Nobody said a word for a very long moment.

“Timmy,” Mr Thompson said at last, “we can all see now that you were telling us the truth. But remember this. If you cry ‘Ankylosaurus’ too many times when it isn’t true, people may not believe you on the day it matters most.”

Timmy nodded slowly. He had felt it himself, standing in the square with the truth in his mouth and nobody willing to hear it, and he never forgot how that felt.

From that day on, he shared his love of dinosaurs through stories and drawings instead of pranks, and the village came to call him their own young palaeontologist. The villagers admired his knowledge, and often walked out with him to see what he had found.

As for the Ankylosaurus, it stayed a treasured memory for all of them — a reminder of the sort of wonder that can turn up in an ordinary wood on an ordinary morning, if only there is somebody left who will believe you when you say so.