Has there ever been a chicken documented to have both ovaries and testes?
I have never heard of a bird that had both ovaries and testes be functional. (I can't say whether any existed, just that I never heard of them.) But I have read of at least chicken that had non-functional versions of both:
https://www.backyardchickens.com/threads/i-have-an-androgynous-chicken.1504007/page-4#post-26254503
^This thread talks about a chicken that displayed both male and female traits.
After the chicken died, the body was sent for necropsy at the state lab.
The necropsy report included the following statements:
"Reproductive system: The oviduct is small and immature. In the area of the ovary are two oblong, tan gonads that appear similiar to testicles."
"The changes to the gonads and the external characteristics of this chicken support the clinical suspicion of this chicken being intersex."
(That particular chicken never laid eggs, and mostly did not crow either.)
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