Red factor / red pied
A variant of Congo African grey (Psittacus erithacus)
Representative Congo African greyphoto — a dedicated image of this exact morph isn't available yet.
Birds showing extra red feathering beyond the tail. Although random red flecks can crop up sporadically in normal birds, the named 'red factor' pet-trade line is a selectively bred mutation developed from F2 pied stock in the late 1990s.