Cows vs. Prong Horns

On our way to school the other day, Kate asked what the animals in the field were.  I told her they were called Prong Horns.  Sam said, "No they aren't. "  I said, "Well, some people call them Antelope, but Dad said they are actually Prong Horns."  Sam said, "How can they be antelope?  They are FAT and BLACK."  He was looking at the COWS.  Kate and I laughed.