Winged cats have been reported for centuries (there was one in I, Claudius) and they’re usually skin tags or clumps of fur on long haired cats.
It seems to be down at the moment (probably Farked), but messybeast.com/winged-cats.htm has an article on winged cats. If it’s the one I remember, it’s pretty useful.
Ursula K. Le Guin wrote a children’s book called Catwings about four young cats with wings who fly out of the city and look for a safe place to live. She also wrote sequels to it, but I didn’t know that until I Googled Catwings to confirm the title of the first book. (I am unable to determine at this time whether the winged cats had feathers or fur on their wings.)
My cat tried flying a few nights ago. It didn’t go well.
He climbed up the corner of my house to the roof rafters, and then tried to make his way paw over paw along the side of the building where it met the roof. Eventually he ran out of steam and dropped about fifteen feet to the ground.
There was quite a thunk when he landed, which attracted the neighbour’s dog, who poked him with her nose a few times until the cat started moving.
Much to my relief, the cat was not injured – just a bit stunned for a minute. He loves to climb things, but occasionally overestimates his abilities. I hope he does not climb up to the roof again – either that or I hope he grows some wings.