Animal Quote by Mark Twain

If Darwin's theory should be true, it will not degrade man; it will simply raise the whole animal world into dignity, leaving man as…

— George Eliot

I have been scientifically studying the traits and dispositions of the "lower animals" (so-called,) and contrasting them with the traits and dispositions of man.…

— Mark Twain

Within the period of human history we do not know of a single instance of the transformation of one species into another one. It…

— Thomas Hunt Morgan

No theory changes what it is a theory about; man remains what he has always been.

— B. F. Skinner

First... a new theory is attacked as absurd; then it is admitted to be true, but obvious and insignificant; finally it is seen to…

— William James

Wonderful theory, wrong species.

— E. O. Wilson

Theories are just fantasies. And they change.

— Michael Crichton

We have reached a situation where a theory has been accepted as fact by some, and possible contrary evidence is shunted aside. [This is]…

— Robert Shapiro

Evolution as such is no longer a theory for a modern author. It is as much a fact as that the earth revolves around…

— Ernst Mayr

Let us leave theories there and return to here's hear.

— James Joyce

The important question is whether [a theory] is true, not whether envisioning an alternative is too intellectually painful to bear.

— J. D. Trout

I would give absolutely nothing for the theory of Natural Selection, if it requires miraculous additions at any one stage of descent.

— Charles Darwin