This is due to a developmental difference, where in the embryo, the male zebra finch produces testosterone, which is transformed into estradiol in the brain, which in turn leads to the development of the nervous system for a song system.
This is due to a developmental difference. The male zebra finch produces testosterone. This is in the embryo. Testosterone is transformed into estradiol in the brain. The brain in turn leads to the development of the nervous system for a song system.