noun
red junglefowl
A species of wild bird (Gallus gallus) native to Southeast Asia; the primary ancestor of the domestic chicken.
セキショクヤケイはニワトリの祖先と考えられている。
The red junglefowl is considered the ancestor of the domestic chicken.
ニワトリ is the domestic chicken, while セキショクヤケイ is its wild ancestor.
From 赤色 (red) + 野鶏 (wild chicken). The exact historical derivation is uncertain; the name describes the bird's reddish plumage and wild nature.