Mammals Breastfeed - What I Thought Was Totally Obvious

I recently got this comment: "Breastfeeding is weird" and when I asked for an explanation, I got, "you don't see that something that is supposed to be a higher form of life has the same processes as a cow. #PeopleUdders"

*sigh*

Let's review. People are mammals. Cows are mammals. It never occurred to me that I would need to state this OR define the word, but it seems I do (given the rest of the mind-melting conversation), so here goes:

mammal (noun) any of a class (Mammalia) of warm-blooded higher vertebrates (as placentals, marsupials, or monotremes) that nourish their young with milk secreted by mammary glands, have the skin usually more or less covered with hair, and include humans (courtesy Merriam-Webster)

The very word "mammal" comes from the fact that we have mammary glands from which we nourish our young. If that's weird, wrong, gross, or any number of other negative slurs we all regularly hear and read, I don't want to be normal, right, prim, or any number of other positive adjectives used to describe those who do things "properly."

Cows make perfect food for baby cows, dolphins make perfect food for baby dolphins, cats make perfect food for baby cats, baboons make perfect food for baby baboons, and human mothers make perfect food for young humans. It's quite a simple concept.

Can we all move on now?