Heusner has seen a pigeon destitute of feathers, and which engendered a female which in her turn transmitted the same characteristic to two of her young.
Sexualism and Hair Growth .-- The growth or development of the hair may be accelerated by the state of the organs of generation.

This is peculiarly noticeable in the pubic hairs and the beard, and is fully exemplified in the section on precocious development (Chapter VII); however, Moreau de la Sarthe showed a child to the Medical Faculty of Paris in whom precocious development of the testicles had influenced that of the hair to such a degree that, at the age of six, the chest of this boy was as thickly set with hair as is usually seen in adults.

It is well known that eunuchs often lose a great part of their beards, and after removal of the ovaries women are seen to develop an extra quantity of hair.

Gerberon tells of an infant with a beard, and Paullini and the Ephemerides mention similar instances.
Bearded women are not at all infrequent.

Hippocrates mentions a female who grew a beard shortly after menstruation had ceased.