In addition to the skin or hide of an animal, 'fell' is also used in culinary vocabulary to describe the tissue confining a muscle group as in a leg of lamb. Cf Julia Child et al, Mastering the Art of French Cooking, vol. I, p. 329, "Preparing a leg of lamb for cooking... Do not remove the fell or filament covering the meat."
Thanks, jojo, and welcome aBoard. Sorry to go off-topic, but the skin or hide of an animal reminded me of a joke I read long ago:
Willy: Didja know baseballs are covered with hide?
Silly: Hide?
Willy: Hide, hide--a cow's outside!
Silly: Who the heck's afraid of a cow?
Yeah, I know; but it holds fond memories for me.
Ever been nose to nose with one? Those heads are huge?
I'm always grateful for whichever joke I understand. I did!!!!!