A group of cats is referred to as a clowder or a glaring.  An unneutered male cat is called a tom (or a gib, if neutered) and an unneutered female cat is called a queen.

The smallest wildcat today is the Black-footed cat.  The females are less than 20 inches (50 cm) long and can weigh as little as 2.5 lbs (1.2 kg).

The group of words associated with cat (catt, cath, chat, katze) stem from the Latin catus, meaning domestic cat, as opposed to feles, or wild cat. 

The Egyptian Mau is probably the oldest breed of cat.  In fact, the breed is so ancient that its name is the Egyptian word for 'cat'.