There is no scientific reason to think that we even with space travel are going to survive as a species for ever certainly not by biting off the hand that feeds us which is exactly what we are doing.

First I shall name the eagle of which there are three species: the great grey eagle is the largest of great strength and high flight he chiefly preys on fawns and other young quadrupeds.

The fidelity question is difficult for me. Society has made us believe we're supposed to be monogamous when we're not killer whales or whatever the monogamous species is.

Indeed the whole human species is endangered by nuclear weapons or by other means of wholesale destruction which further advances in science are likely to produce.

Thousands of years ago humans domesticated every possible large wild mammal species fulfilling all those criteria and worth domesticating with the result that there have been no valuable additions of domestic animals in recent times despite the efforts of modern science.

When I began in 1960 individuality wasn't an accepted thing to look for it was about species-specific behaviour. But animal behaviour is not hard science. There's room for intuition.

Is it not a species of blasphemy to call the New Testament revealed religion when we see in it such contradictions and absurdities.

The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking and its right to exist is coextensive with its power of resisting extinction by its rivals.

If epic poetry is a definite species the sagas do not fall within it.

We will never bring peace at the hands of war. As a species we have to rise above it.

Nature is indifferent to the survival of the human species including Americans.

A strong body makes the mind strong. As to the species of exercises I advise the gun. While this gives moderate exercise to the body it gives boldness enterprise and independence to the mind. Games played with the ball and others of that nature are too violent for the body and stamp no character on the mind. Let your gun therefore be your constant companion of your walks.

In June as many as a dozen species may burst their buds on a single day. No man can heed all of these anniversaries no man can ignore all of them.

Men and women belong to different species and communications between them is still in its infancy.

Love is only a dirty trick played on us to achieve continuation of the species.

A man reserves his true and deepest love not for the species of woman in whose company he finds himself electrified and enkindled but for that one in whose company he may feel tenderly drowsy.

As a species we are always hungry for new knowledge.