So I've had this running disagreement with t.n. All mammals have a backbone. All mammals have four limbs. All mammals breath air. All mammals are warm-blooded.
All mammals produce milk for their young.
A bit of more info here on the suitability of men to breastfeed. While I was on my quest for information, Luke sent me this . Crossword puzzles are so my thing. I am champing at the bit. She can tell, I guess, because she offers it to me when she's ready to give up.