“Useful little treasure detectors,” said Hagrid happily. “Thought we’d have some fun with ’em today. See over there?” He pointed at the large patch of freshly turned earth Harry had watched him digging from the Owlery window. “I’ve buried some gold coins. I’ve got a prize fer whoever picks the niffler that digs up most. Jus’ take off all yer valuables, an’ choose a niffler, an’ get ready ter set ’em loose.”

Harry took off his watch, which he was only wearing out of habit, as it didn’t work anymore, and stuffed it into his pocket. Then he picked up a niffler. It put its long snout in Harry’s ear and sniffed enthusiastically. It was really quite cuddly.

“Hang on,” said Hagrid, looking down into the crate, “there’s a spare niffler here . . . who’s missin’? Where’s Hermione?”

“She had to go to the hospital wing,” said Ron.

“We’ll explain later,” Harry muttered; Pansy Parkinson was listening.

It was easily the most fun they had ever had in Care of Magical Creatures. The nifflers dived in and out of the patch of earth as though it were water, each scurrying back to the student who had released it and spitting gold into their hands. Ron’s was particularly efficient; it had soon filled his lap with coins.

“Can you buy these as pets, Hagrid?” he asked excitedly as his niffler dived back into the soil, splattering his robes.

“Yer mum wouldn’ be happy, Ron,” said Hagrid, grinning. “They wreck houses, nifflers. I reckon they’ve nearly got the lot, now,” he added, pacing around the patch of earth while the nifflers continued to dive. “I on’y buried a hundred coins. Oh there y’are, Hermione!”

Hermione was walking toward them across the lawn. Her hands were very heavily bandaged and she looked miserable. Pansy Parkinson was watching her beadily.

“Well, let’s check how yeh’ve done!” said Hagrid. “Count yer coins! An’ there’s no point tryin’ ter steal any, Goyle,” he added, his beetle-black eyes narrowed. “It’s leprechaun gold. Vanishes after a few hours.”

Goyle emptied his pockets, looking extremely sulky. It turned out that Ron’s niffler had been most successful, so Hagrid gave him an enormous slab of Honeydukes chocolate for a prize. The bell rang across the grounds for lunch; the rest of the class set off back to the castle, but Harry, Ron, and Hermione stayed behind to help Hagrid put the nifflers back in their boxes. Harry noticed Madame Maxime watching them out of her carriage window.

“What yeh done ter your hands, Hermione?” said Hagrid, looking concerned.

Hermione told him about the hate mail she had received that morning, and the envelope full of bubotuber pus.