webbed

patagium \puh-TAY-jee-um\

noun
1 : the fold of skin connecting the forelimbs and hind limbs of some tetrapods (as flying squirrels)
2 : the fold of skin in front of the main segments of a bird's wing

Captivated as I was by my furry friends in Independence Park, I never noticed one to have any type of patagium. Perhaps flying squirrels and their more ambulatory kin don't share social circles.