So when I was at Oz Comic Con I was talking to Mark Sexton, the lead storyboard artist for Mad Max Fury Road, and he told me that the Crow people on stilts at the Green Place aren’t the abandoned male children of the Vuvalini - they’re what remains of the Vuvalini (female and male) who decided to stay there rather than going off like the ones Furiosa meets. Apparently the Vuvalini split into two groups - those that remained and those that left. The ones that stayed adapted to try and catch crows and eat them and apparently there’s this whole culture they have that was designed but eventually not shown in the movie (though its existence is canon). The Crow People no longer follow the old ways of the Vuvalini (which would explain why the Vuvalini Furiosa meets said “we’re the only ones left” - alternatively the Vuvalini might have thought there’s no way the ones left behind could have survived).
I don’t know where the “Crow people are the children the Vuvalini abandoned because they were male” theory came from but Mark Sexton was privy to all the discussions of the plot of Fury Road and was responsible for quite a bit of it, and he knows the ins and outs of what was shown on screen vs what was not so I’d say his word on the subject can be taken as canon…
Makes me happy to learn this because it bothered me to think of the Vuvalini as being so sexist as to leave male children in an inhospitable place just because they were male. Didn’t ring true.