I had learned that a dexterous, opposable thumb stood among the hallmarks of human success. We had maintained, even exaggerated, this important flexibility of our primate forebears, while most mammals had sacrificed it in specializing their digits. Carnivores run, stab, and scratch. My cat may manipulate me psychologically, but he'll never type or play the piano.
We cut the throat of a calf and hang it up by the heels to bleed to death so that our veal cutlet may be white; we nail geese to a board and cram them with food because we like the taste of liver disease; we tear birds to pieces to decorate our women's hats; we mutilate domestic animals for no reason at all except to follow an instinctively cruel fashion; and we connive at the most abominable tortures in the hope of discovering some magical cure for our own diseases by them.