Take the wings off a bat
From Fallen London Wiki
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From: Licensed by Mr Hearts
It's hard to say which is more annoyed by the prospect of the transaction, the bat or the Proprietor.
Unlocked with 
1 x Sulky Bat
Locked with 
Revisions to the Business Model of a Butchery
Success
Honestly...
[...] The Bat nestles against the Proprietor and stares at you with beady hate.
"If you want some bat wings, I've got a few spares you can have [...]" He goes on stroking the Sulky Bat's fur. Ingrate. It was never so affectionate with you.
