I don't know if it's considered an ability, but one of our cats has seven toes... he has one extra claw that he sometimes uses as a sort of oppose-able thumb, and then there's a tiny extra claw between that and his normal claws. He uses them for extra climbing dexterity.The other cat teleports into the bathroom every time you go, so that she can play in the sink. Usually you see her at the bottom of the stairs, and then when you get to the bathroom, she's sitting on the sink. Sneaky.