Man is naturally a political animal.
Aristotle

Man is the animal that intends to shoot himself out into interplanetary space, after having given up on the problem of an efficient way to get himself five miles to work and back each day.
Bill Vaughan

Man is the only animal for whom his own existence is a problem which he has to solve.
Erich Fromm

Man is the only animal that blushes - or needs to.
Mark Twain

Man is the only animal that can be skinned more than once.
Jimmy Durante

Man is the only animal that can remain on friendly terms with the victims he intends to eat until he eats them.
Samuel Butler

Man is the only animal that laughs and has a state legislature.
Samuel Butler

Man is the only animal that laughs and weeps; for he is the only animal that is struck with the difference between what things are, and what they ought to be.
William Hazlitt

Man is the only animal that learns by being hypocritical. He pretends to be polite and then, eventually, he becomes polite.
Jean Kerr

Man is the only animal whose desires increase as they are fed; the only animal that is never satisfied.
Henry George

Man is the religious animal. He is the only one that's got true religion, several of them.
Hal Holbrook

Man is the unnatural animal, the rebel child of nature, and more and more does he turn himself against the harsh and fitful hand that reared him.
H. G. Wells

Man, an animal that makes bargains.
A. C. Benson

Man, in his animal capacity, is qualified to subsist in every climate.
Adam Ferguson

Measles and TB evolved from diseases of our cattle, influenza from a disease of pigs, and smallpox possibly from a disease of camels. The Americas had very few native domesticated animal species from which humans could acquire such diseases.
Jared Diamond

Men always do leave off really thinking, when the last bit of wild animal dies in them.
David Herbert Lawrence

Men! The only animal in the world to fear.
David Herbert Lawrence

Mind and spirit together make up that which separates us from the rest of the animal world, that which enables a man to know the truth and that which enables him to die for the truth.
Edith Hamilton

My assumption is that fundamentally the picture of the human animal, as developed by Freud, is largely right.
Peter Gay

My favorite animal is steak.
Fran Lebowitz