We must categorize and simplify in order to comprehend. But the reduction of complexity entails a great danger, since the line between enlightening e… - Stephen Jay Gould

[A]lthough species may be discrete, they have no immutable essence. Variation is the raw material of evolutionary change. It represents the fundamental reality of nature, not an accident about a created norm. Variation is primary; essences are illusory. Species must be defined as ranges of irreducible variation.

The study of social setting does not imply either the irrelevance or nonexistence of a factual world out there.

It is so hard for an evolutionary biologist to write about extinction caused by human stupidity. […] Let me then float an unconventional plea, the inverse of the usual argument. […] The extinction of Partula is unfair to Partula. That is the conventional argument, and I do not challenge its primacy. But we need a humanistic ecology as well, both for the practical reason that people will always touch people more than snails do or can, and for the moral reason that humans are legitimately the measure of all ethical questions—for these are our issues, not nature's.