[Junior]

You seem to think that mammary glands are the sole arbiter of what may or may not be a mammal. Sorry, it doesn't work that way. All mammals share some things in common, mammary glands being only one of those features. Mammals also have some sort of hair or fur (sparse in some cases, heavy in others), differentiated dentiture, a like number of holes in their heads and the ear bones in internal ears. Just so happens that in modern animals, all the critters who share the latter features also have mammary glands. Of course you can pull a medved and scream "things were different in the old days! And four out of five makes you a lizard!" But then you'd be flying in the face of evidence, which is pretty much what you do anyway.

[gore3000]

"You seem to think that mammary glands are the sole arbiter of what may or may not be a mammal.

The scientific definition of a mammal is that it has mammary glands. The definition of a bird is feathers (not wings). You should learn a little about what you speak of before spouting your verbal diarrhea.