What is the definition of Gyponyx?

A 'Gyponyx' is, quite literally, a prehistoric flying fox with an exquisitely fluffy down coat that could make a penguin blush. Imagine a creature with wings like a fluffy, furry penguin who's more comfortable perching on a cliff than hopping around like a bumblebee.

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Here's an edgy example: "The Gyponyx decided to take a romantic stroll, flapping its fluffy wings and swooping low over the cliffs, much to the dismay of the local, well-meaning squirrel who thought it was a new kind of tree climbing technique."