https://www.bhwt.org.uk/hen-health/learn-about-hens/hermaphrodites/
Hermaphrodites
It is a well-documented fact that female chickens (hens) can take on the
characteristics and behaviour of male chickens and essentially turn into
cockerels.
How is this possible?
Female chickens only have one functioning ovary, although they are born
with two. The right ovary becomes dormant in every hen (it is not defined
as an ovary or testes and is a non-functioning sex organ), the left ovary
is responsible for egg production.
In some circumstances, where a health-related issue such as an ovarian
cyst or adrenal gland disease is present, the left ovary shrinks. As the
hen ends up without a left ovary, the dormant right sex organ starts to
grow but may take the form of a male testes.
The resulting βhe / sheβ will develop the large comb and wattles of a
cockerel and may start to crow. However, she will not be a fully
functioning cockerel, nor will she lay eggs.
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