Without a rooster around, Vulture has taken up crowing. This video was taken this morning.
She has always been the top hen; she's a couple weeks older than the others, will sometimes peck on Penguin or Fancypants, and won't let me pet her like the other hens. I hear that it does happen occasionally where a hen will crow as part of the dominant role. In some cases however, crowing's a sign of a hormonal imbalance and a hen may even stop laying eggs. Hopefully she's just doing her thing and will continue laying eggs for us!