"It's a piece of Old Norse magitech," Lovegood was saying, as he rounded the corridor.
Severus stared; he'd never seen a clockwork magpie.
"What does it do?" asked Granger.
Lovegood pushed in the bird's beak. "It's actually an entire flock."
With a click! the contraption reconfigured itself into several smaller ones.
"Newt Scamander used these devices to help him catalogue his beasts."
"How?" Granger asked, her eyes as wide as Severus' as they followed the circling magpies.
Lovegood pointed her wand at the flock and commanded, "Leita!" and the magpies flew through the nearest wall . . . as if it weren't there.