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A Bird, Cardinal, Has Been Observed To Be One-Sided Male And The Other Side, Female—A Condition called “Gynandromorph.” This Sexual Split, Though Not Yet Confirmed In The Bird, Has Been Reported In Reptiles, Butterflies, And Crustaceans. Scientists Are Curious As To How This Would Make Them Different From Conventional Cardinals.

A Rare Bird Indeed: A Cardinal That’s Half Male, Half Female – The New York Times

https://www.nytimes.com/2019/02/09/science/cardinal-sex-gender.html

In a backyard in Erie, Pa., an unusual cardinal has appeared, displaying both male and female traits. Scientists say it may be a so-called gynandromorph.