Moo?

One day of flying, three herds of frightened cows and six very confused farmers later, Clint had proved to be a very capable broom rider (he did not mention that he had, in fact, flown before), and had been extremely impressed by Harry's skills on a broom.

It is hard not to be impressed by someone so downright insane that they're willing to fly not over, but under, a cow, just to prove that they can.

The cow in question would later become a global curiosity after being recorded the first cow to produce yoghurt instead of milk.

—- Chapter 28, The Calm (Mostly)