Perhaps most mammals and birds understand empathy, but plenty of animals in classes like reptiles, insects, amphibians, don’t exert almost any empathy as humans understand it.

To be fair, the word butter is very vague. Shea butter has no milk, apple butter has no milk, etc.

Your very slightly incorrect internet comment has ignited me with a passion to correct you. The interval in Killing in the Name is not nine half steps, but rather a minor 9th, which is 13 half steps.