Whenever we find, in two forms of life that are unrelated to each other, a similarity of form or of behaviour patterns which relates to more than a few minor details, we assume it to be caused by parallel adaptation to the same life-preserving function.

Konrad Lorenz

Konrad Lorenz

Profession: Scientist
Nationality: Austrian

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Evil, by definition, is that which endangers the good, and the good is what we perceive as a value.

'I don't need brains,' says the billionaire contemptuously. 'I'm brainy enough myself!' The broker cries out in desperation, 'What, in heaven's name, do you want?' 'Goodness,' is the answer.

The bond with a true dog is as lasting as the ties of this earth will ever be.

The father-mother family with two children isolated in a city flat is already insufficient.

Practically all animals which move fast in a homogeneous medium have found means of giving their body a streamlined shape, thereby reducing friction to a minimum.

We do not take humor seriously enough.

Most of the vices and mortal sins condemned today correspond to inclinations that were purely adaptive or at least harmless in primitive man.

There is indeed the possibility that the evolutionary process has, in gray antiquity, bred into us an excess of aggression.

From a neighbour, I got a one-day-old duckling and found, to my intense joy, that it transferred its following response to my person. At the same time, my interest became irreversibly fixated on water fowl, and I became an expert on their behaviour even as a child.

I believe that present day civilized man suffers from insufficient discharge of his aggressive drive.

Barking dogs occasionally bite, but laughing men hardly ever shoot.

In the course of evolution, it constantly happens that, independently of each other, two different forms of life take similar, parallel paths in adapting themselves to the same external circumstances.

Ethologists are often accused of drawing false analogies between animal and human behaviour. However, no such thing as a false analogy exists: an analogy can be more or less detailed and, hence, more or less informative.

It is a good morning exercise for a research scientist to discard a pet hypothesis every day before breakfast. It keeps him young.