My wife had a gray for about ten years, loved her, me not so much. The flying squirrels are absolutely amazing WWB, you're right. I cut a pine limb with a nest in it once, the momma went sailing out but four little pink ones about the size of a big grub worm hit the ground. I watched her come back, search through the grass until she found one. She'd grab it by the scruff of the neck, carry it to a nearby oak, climb to the very top and sail to another pine tree a good thirty yards away that had another nest in it. In a flash she'd sail back and repeat the process until she got the last one. I was amazed that she could fly while holding the babies.