An example of a phenomenon known as gynandromorphy, this rare half-male, half-female cardinal was spotted by bird-lovers in Pennsylvania. https://on.natgeo.com/2GmleVI | National Geographic

Cardinal bird (Northern Cardinal, Cardinalis cardinalis): Males are famous for their vivid red feathers and black mask, while females are more brownish with reddish tinges for better camouflage. The bird is named after the bright red robes worn by Catholic cardinals. Unlike most songbirds, both male and female cardinals sing. Females often sing to communicate with their mates, especially during nesting. Males are highly territorial and will aggressively attack their reflection in mirrors or wind