Well, you could look it up on the discovery website. Or you could watch A Bug's Life, it's actually kind of educational. But what i remember is that the queen ant is the only ant that gives birth....or I'm thinking about bees...i don't know...sorry
No, ants are not mammals. They are insects. The main characteristic of a Mammal is that is gives birth to live young. Ants are hatched from eggs so therefore cannot be categorised as mammals. Ants also have the characteristic three part body of an insect. == ==
Yes, ants do have a leader. The queen ant is the leader of all the ants. However, there are ants of a higher rank that tell the lower rank ants what the queen wants. It is sort of like being in the army.