Harry turned to look outside. Something very small and gray was bobbing in and out of sight beyond the glass. He stood up for a better look and saw that it was a tiny owl, carrying a letter that was much too big for it. The owl was so small, in fact, that it kept tumbling over in the air, buffeted this way and that in the train's slipstream. Harry quickly pulled down the window, stretched out his arm, and caught it. It felt like a very fluffy Snitch. He brought it carefully inside.
Professor McGonagall pulled herself back through the portrait hole to face the stunned crowd. She was white as chalk.