Cardinal bilateral gynandromorphism
Split-colour bird is half male, half female
http://www.huffingtonpost.com/2014/12/30/half-male-half-female-bird-cardinal-plumage_n_6392336.html
(FR) http://www.huffingtonpost.fr/2015/01/01/photo-oiseau-double-plumage-male-femelle-gynandromorphisme-bilateral_n_6403366.html?utm_hp_ref=france