The 'fat cats' of congress are actually gluttonous gruesomly obese and devoid of muscle or brains. This is only my own somewhat bitter opinion though, as I've really never seen the inside of one. Probably if any man ever did he would die of horror.
The wild cat I took the fat from was terminated by my wife at her hen house after it had killed all her laying hens. But it had only eaten one. I believe it had fattened on road killed deer still fat in the fall, and probably grouse, as there are no rabbits in this area for many miles.
Perhaps you've read of wildcat/lynx being called 'arctic chicken' by trappers and sourdoughs. -- I had to try it, and formed a very 'strong' opinion of this matter also. I believe the only people who could call it chicken are those who live in tiny cabins hanging full of stinking fur pelts. I don't quit easy though. I parboiled it twice, then boiled it till it was tender and it tasted like as fine a pork roast as I've ever eaten. Boiling for a few hours is the only way I know of to get bobcat or mountain lion tender enough that it can be chewed. Muscles of either, if sliced thin would make a fine shoe leather.
As for polecat. I'm going to have to live a lot longer before I learn anything about their fat! When I was a kid, the best gun oils were refined animal and bird fat, with clarified bird fat considered the ultimate. It is made by rendering any bird fat I presume, at low heat, then setting in a warm area to let it settle. The oil (from chicken fat) which rises to the top, remains liquid at temperatures down to about 70 deg F, and is actually a better lubricant for metal working than cat fat, but cat fat stays liquid down almost to freezing. Bear lard, or rendered fat liquifies at perhaps 100 deg F, cooler than hog lard, and is a better cutting oil than chicken, but has to be kept in a warmed cup so it can be applied with a brush. If any of these are used to lubricate firearms, they should be applied to warmed parts then wiped clean with a rag. The remaining film will stay and make parts slide freely in any weather, with minimal attraction to dirt.
Remember all these things guys, in case big oil shuts all the fine petroleum lubricants off!