"Next to the plainly expressed desire to quench their thirst the dominant thought in the minds of those animals, one and all, was the fear of being attacked. In some species this ever-present and harassing dread was a pitiful spectacle. I wish it might be witnessed by all those ultra-humane persons who think and say that the free wild animals are the only happy ones!"
January 1, 1970
https://en.wikiquote.org/wiki/Wild_animal_suffering