I feel that one species, mankind, doesn't have the right to exterminate

I had found again and again that the most aberrant population of a species - often having reached species rank, and occasionally classified even as a separate genus - occurred at a peripheral location, indeed usually at the most isolated peripheral location.

There are a number of attributes of species and populations that are not of any particular selective advantage to any single individual in a population but that are of great advantage to the population as a whole.

The reduced variability of small populations is not always due to accidental gene loss, but sometimes to the fact that the entire population was started by a single pair or by a single fertilized female. These 'founders' of the population carried with them only a very small proportion of the variability of the parent population. This 'founder' principle sometimes explains even the uniformity of rather large populations, particularly if they are well isolated and near the borders of the range of the species.

Evolution thus is merely contingent on certain processes articulated by Darwin: variation and selection.

It is curious how often erroneous theories have had a beneficial effect for particular branches of science.

A species is a reproductive community of populations reproductively isolated from others that occupies a specific niche in nature.