Our descent, then, is the origin of our evil passions!! The devil under form of Baboon is our grandfather.

The most important factor in survival is neither intelligence nor strength but adaptability.

On your life, underestimating the proclivities of finches is likely to lead to great internal hemorrhaging.

Daily it is forced home on the mind of the biologist that nothing, not even the wind that blows, is so unstable as the level of the crust of this earth.

Nature will tell you a direct lie if she can.

Building a better mousetrap merely results in smarter mice.

I have steadily endeavored to keep my mind free so as to give up any hypothesis, however much beloved (and I cannot resist forming one on every subject), as soon as the facts are shown to be opposed to it.