-Traditional gender roles! Cutter goes on a recue mission, and then again after the humans with an all-male team, while the women and children cower in their trees.
Read some speculating that it was purely for practical reasons. Since the tribe was so far down on members having females go away on any kind of dangerous mission during which they'd risk dying would be kinda bad; less females = less child bearers - both Rainsong and Moonshade had small children. Of course it really makes it impractical that both Joyleaf, Brownberry, and Foxfur went out on that ill-fated hunt...
Did the lady wolfriders learn about emancipation from Leetah, Winnie and Kahvi?
Judging by Leetah's reaction to Dewshine going on the zwoot-hunt I think she crew up under fairly traditional gender-roles as well.