Silver Duckwing
A variant of Phoenix (Gallus gallus domesticus)

Representative Phoenixphoto — a dedicated image of this exact morph isn't available yet.
The most widely recognized Phoenix color: silver-white hackle and saddle, black breast, and a silvery-grey wing 'duckwing' bar on the cock, with a long flowing tail. The default Phoenix in most flocks.
Keeper tips for this variant
Tail length is the whole point — give tall, smooth high roosts and immaculate dry litter so the long tail feathers stay clean and unbroken.