Patagium

Last night while standing outside my building I saw a flying squirrel. It is only the second time in my life I have seen one. I noticed an object alight in the high branches of an elm. It climbed to a height of about forty feet and huddled in the crook of the tree.

Silently it leapt, crossing a distance of about thirty feet, to another tree.

The thin flesh it extends while gliding is called the patagium.

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