Assertion: flying squirrel | /r/HasAspect | fleshy stretch of skin
Facets:
Source sentences:
text: Every flying squirrel has a fleshy stretch of skin all covered in fur called a "patagium" - it extends out between their flexible joints, and when outstretched can be used to control direction and speed while in mid-air by adjusting how taut or loose the patagium is held by the squirrel.