A gynandromorph bird has a mixture of genetically male and
female cells. The term is from Greek "gyne" female and
"andro" male. The scientists believe gynandromorphs are created when
an egg becomes fertilized by two sperm. It's likely that the phenomenon
occurs in all birds’ species but it's not always obvious because males and
females of many species often look similar.
- The Half-male, half-female research appeared March 11 in the journal Nature.