11001-47322 Common pheasant (Phasianus colchicus mut. tenebrosus) a popular introduced gamebird. a popular introduced gamebird. Pheasants in NZ are of mixed ancestry, and are a hybrid blend of English blackneck (Phasianus colchicus colchicus), Chinese ringneck (Phasianus colchicus torquatus), and Mongolian pheasant (Phasianus colchicus mongolicus). Although "pure" specimens, don't occur, this male most resembles the 'melanistic mutant' form of the English (black-necked) subspecies.