lol... well, we call them chipmunks, but yeah... on girls, good eyeliner, nice dark V on top of head, and defined dorsal stripes... boys are less defined markings, head splotches, and faint/broken up eyeliner and V's...
It's awesome to be able to tell the girls from boys right away too... and pretty blue eggs, lol...
I'm feeling better on the autosexing of my lines now too... was worried for a minute, but just turns out both my hatches this year was all boys, lol...