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A cat who has been neutered will have to say a tearful farewell to its testicles - as his owner plans to AUCTION them off.

Butters the Kit Kat is a local celebrity in San Francisco's trendy Haight-Ashbury and often poses for photographs with tourists to the area.

The puss, who sits on the Haight-Ashbury junction on top of a sign reading, "Pigeons here taste like s***", has long been an online star with his own Instagram account and more than 7,500 followers.

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Owner Johnny Fogarty writes in Butters' voice: "The original Haight-Ashbury KoolKat. Everyone of my fans help promote me to stardom."

Recently, though, the posts took a darker turn for the cat : "My nuts were making me so crazy that I started ATTACKING and bitting dad as well as anyone that got in my way.

"So now I've got my nuts up for sale to pay for the vet bills..."

Touted as 'one-of-a-kind Butters' nuts', they haven't raised much interest as yet, but perhaps the interested party is just saving up some cash before they can finally go nuts.