The Onagadori (roughly means "Honorable Fowl") is a rare breed of long-tailed chickens from Japan. It was first thought to be a descendant of the Shoukoku, but recent modern genetic researches have already weakened this theory. The Onagadori breed's roots are quite ancient and its ancestry is believed to have been from a mixing of the green male junglefowl and the red female junglefowl (i.e. Bekisar). It was from the cross-breeding of the Totenko and the Shokoku that the Onagadori was born and the species refined from around 1912 to 1926 (the Taisho period) to what we know it as today. In the 1920's to preserve their beautiful tails, they came to be bred as cage birds. The Onagadori is one of Japans treasured monuments.

The Onagadori's trademark feature is the non-molting tail feathers, that if kept in the best conditions with high levels of animal husbandry, grow for the lifetime of the roosters. While, the hens molt normally, as do the feathers that cover roosters' heads, breasts, backs, and legs. The Onagadori has also long saddle feathers, and hens themselves show the signs of having a wealth of feathers. Onagadoris have single combs, white earlobes, relatively medium-sized fine wattles, and slate-blue legs. The hens are poor layers of light brown eggs (around 25 eggs per year), but they are known for being broody. On avarage, the weights for rooster and hen are 1.8 kg and 1.35 kg, respectively.