Rare half male, half female cardinal spotted in Pennsylvania
A gynandromorph cardinal: one half male, the other half female – Why Evolution Is True
Why Is This Northern Cardinal Yellow?
Bizarre Half-Male, Half-Female Bird Discovered In Pennsylvania
A rare bird indeed, Sunday Observer
Northern Cardinal - Meet the Cardinal
Half-male, half-female bird spotted in Pa.
Extremely rare bird: 'Half male, half female' cardinal spotted in USA's Pennsylvania
Why Cardinals Rule - Scenic Hudson
Northern Cardinal (Cardinalis cardinalis)
Researchers Spot Half-Male Half-Female Bird At Pennsylvania Reserve
A Rare Bird Indeed: A Cardinal That's Half Male, Half Female - The New York Times