If you watch lizards and lions copulating, then you will see that in 200 million years the male has not had a single new idea.

Animal language is a contagious expression of mood effecting communication between social partners.

What could not be denied was that in vast segments of the animal world natural selection of the most qualified individuals took place not by competition for females but by competition for space.

The miracle of man is not how far he has sunk but how magnificently he has risen. We are known among the stars by our poems, not our corpses.

Men, unlike mockingbirds, have the capacity for systematic self-delusion. We echo each other with equal precision, equal eloquence, equal assurance.

For the soundest of evolutionary reasons man appears at his best when times are worst.

What truly leads the evolutionary procession, in other words, is behavior.