Cuckoo
A variant of Dorking (Gallus gallus domesticus)
Representative Dorkingphoto — a dedicated image of this exact morph isn't available yet.
Irregular grey barring ('cuckoo' pattern) over the Dorking frame; a traditional but now uncommon variety.
Keeper tips for this variant
Cuckoo barring is sex-linked — you can sex chicks at hatch by head-spot size, useful for managing this rare colour's limited numbers.