This is the problem with invasive species... they crowd out or otherwise endanger native species by competing for ecological niche. In this case the palila, a beautiful native honeycreeper with a golden head and white body, lives primarily high on the western slopes of Mauna Kea in stands of
māmane trees, which are a primary food source both for their seeds and for the caterpillars that grow on them. But the non-native feral goats and sheep eat the
māmane.
And unfortunately, helicopter hunting is the only practical way to eliminate the animals. But I don't know if this is going to help anytime soon, because I don't know where the funds are going to come from.
It seems funny to me that when that helicopter pilot who transported axis deer to the Big Island agreed to a plea bargain that included 500 hours of flying sharpshooters in his chopper to eradicate the herd that ensued, nobody mentioned that there was a county ban on helicopter hunting.
On the other hand, commercial hunting websites have been pitching helicopter hunting in Hawai'i all along.