Black-tailed White
A variant of Japanese Bantam (Gallus gallus domesticus)

Representative Japanese Bantamphoto — a dedicated image of this exact morph isn't available yet.
White body with a contrasting black tail and the breed's hallmark huge upright tail and ultra-short legs (Chabo). One of the most iconic and shown colors.
Keeper tips for this variant
The extreme short leg comes from a creeper (Cp) lethal gene — never expect a clean hatch, as homozygous embryos die in shell; this is inherent to the breed, so accept reduced hatchability rather than trying to breed it out.