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Every species has come into existence coincident both in space and time with a pre-existing closely allied species.
--
"On the Law which has Regulated the Introduction of New Species" (1855)

 

Alfred Russel Wallace

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Only two suppositions seem to be open to us — Either each species of crocodile has been specially created, or it has arisen out of some pre-existing form by the operation of natural causes.
Choose your hypothesis; I have chosen mine. I can find no warranty for believing in the distinct creation of a score of successive species of crocodiles in the course of countless ages of time.

 

Thomas Henry Huxley

 

In the animal world we have seen that the vast majority of species live in societies, and that they find in association the best arms for the struggle for life: understood, of course, in its wide Darwinian sense — not as a struggle for the sheer means of existence, but as a struggle against all natural conditions unfavourable to the species. The animal species, in which individual struggle has been reduced to its narrowest limits, and the practice of mutual aid has attained the greatest development, are invariably the most numerous, the most prosperous, and the most open to further progress. The mutual protection which is obtained in this case, the possibility of attaining old age and of accumulating experience, the higher intellectual development, and the further growth of sociable habits, secure the maintenance of the species, its extension, and its further progressive evolution. The unsociable species, on the contrary, are doomed to decay.

 

Peter Kropotkin

 

Our best destiny, as planetary cohabitants, is the development of what has been called "species consciousness" — something over and above nationalisms, blocs, religions, ethnicities. During this week of incredulous misery, I have been trying to apply such a consciousness, and such a sensibility. Thinking of the victims, the perpetrators, and the near future, I felt species grief, then species shame, then species fear.

 

Martin Amis

 

We ourselves are part of a guild of species that lie within and without our bodies. Aboriginal peoples and the Ayurvedic practitioners of ancient India have names for such guilds, or beings made up (as we are) of two or more species forming one organism. Most of nature is composed of groups of species working interdependently …

 

Bill Mollison

 

Firstly what does conservation mean? It is not merely the saving from extinction of such species as the Notornis, the Leadbetters Possum or the Leathery Turtle; this is important work but it is only part of the problem. You cannot begin to preserve any species of animal unless you preserve the habitat in which it dwells. Disturb or destroy that habitat and you will exterminate the species as surely as if you had shot it. So conservation means that you have to preserve forest and grassland, river and lake, even the sea itself. This is not only vital for the preservation of animal life generally, but for the future existence of man himself — a point that seems to escape many people.

 

Gerald Durrell