It's also not the last time they use it in the show, it gets re-used later in a different story with some modifications.
|OH GOD WHY DID SOMEONE MAKE THIS|
This episode is what made me decide to subtitle the show. The motion of the bird is just... fantastic. You'll see.
But considering that working with real birds is expensive, this sort of worked.
Torrent link: http://www.nyaa.se/?page=view&tid=700758