Ungulates

Po chose a Smithsonian video at the library. No surprise. He's watching it now while I'm getting some work done. He just approached my desk and asked, "Do you know that cows are ungulates?"

My first thought was that he made up another word, a common practice for him. He'll give you the definition of the made-up word, and everything, so it's pretty believable. I told him I didn't know that cows are ungulates, and could he please tell me more about it.

"Sure. There are different types of ungulates. Cows are the milking kind, and a gazelle is the not milking kind. And a giraffe is also an ungulate."

"Ah," I said. "Thanks for teaching me something (totally made up) new." Then I started to wonder. So I looked it up: http://en.wikipedia.org/wiki/Ungulate. It's way too early in the day to feel this stupid.