セキショクヤケイ Gallus gallus

This “original chicken” is smaller than its domestic descendants, and is widespread throughout South and Southeast Asia; can also be found as an introduced species in many regions around the world (especially prevalent on many Pacific Islands, including Hawaii). In its introduced range and some areas of its native range it has interbred widely with feral and domestic chickens, producing intermediate hybrids. Many of these birds cannot be distinguished from genuine wild-type birds. Within native range calls are useful for ID: the wild male’s crowing is hoarse and choked off towards the end, unlike the loud, vibrant calls of the domestic rooster.