text: are there any medium sized cats? there are big cats, like lions and tigers; and there are domesticated cats. are there cats which are considered medium sized? surely there must be some sort of common ancestor, otherwise what accounts for the size variations? absolutely.  the ocelot is an excellent example; about 4 feet long.  the bobcat, serval, lynx, caracal, and several others are much larger than a house cat, but barely half the size of a lion or tiger.