Kit: Am too.
Sam: Are not.
Kit: Am too.
Sam: Are not!
Kit: Am too.
Sam: Are not.
Kit: Am too.
Sam: Are not!
(I come over to the table...)
Me: What are you too arguing about?
Sam: Kit thinks he is a mammal.
Kit: I AM a mammal.
Sam: Are not!
Kit: I am! I breath air and I drink milk!
Sam: Are not! You can not give birth to live babies and mammals can do that!
Kit stops and thinks.... then he looks at me...
Kit: Didn't you do a dance with Dada to have babies?
Me: Yes.
Sam: (looks at Kit) But YOU don't have the babies!
Me: Yes, but boys do help make the live babies, so therefor, Kit is right. He is indeed a mammal too.