It is the chief function of the ichthyologists, or fish people, to keep pointing out, day after day, the perfect fitness of fish for existence in a liquid medium. And they're right, at that. But I sometimes think that if fish were not well adapted for an aquatic life — if they were square, say — then it would be time to talk.

How to Become Extinct, Fish and Democracy (p. 2), Dover Publications. 1964