Gynandromorphs in humans would be likely mosiac intersex (hit link to see 14 different dual sex animals - beware the offensive and human-centric 'shock headline').These are animals which are dual sex: half male and half female (the birds are quite stunning). You can see that they literally split right down the middle, in coloring and more, in some, gender is only found on a cellular level.I find it facinating that it is so easy to accept the diversity in nature, but refuse the same diversity in humans (as indicated by the title 'shemales of nature' Sigh).
Also from science are studies on the nature of birds that live as females (more offensive and human-centric 'shock headline'). What makes it unusual is that these are birds of prey, historically and emotionally seen as 'dominant males'. The birds mimic or live as females with female plumage often for protection and other reasons (including, yes, sex!).
I went exercising for several hours, so I am totally punked out. Will be all insightful in a bit.
8 hours ago