Thus far, we've only talked about how hormones can organize the genitalia and the brain and behavior. At least 100 species are sequential hermaphrodites. Sperm released within 14-18 days aggression is believed to be the major factor that inhibits sex change. Causes adrenal steroid release which inhibits brain pathways for male behavior. Lower subordiante females give few and get few.
T causes development of male pattern.
For example, mollies. Parameters for change are similar to what we've already described. But, genitalia also change. DDT causes thinning of bird eggshells. Originally thought that decline was due to poaching.