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.
Everyone agrees that animals should not be exposed to unnecessary pain. But neither should scientists be hamstrung by the requirement to use anesthesia in every animal experiment that might cause pain.
I've worked with the Los Angeles Zoo for 45 years, and we have this magnificent photographer, Tad Motoyama. He takes these wonderful, wonderful animal pictures. All through the years he's given me copies of these pictures. Well, I have all these gorgeous ones, so I said, 'Tad, I want to do a book with your picture on one side.'
There's nothing funnier than the human animal.
Man is an animal that makes bargains: no other animal does this - no dog exchanges bones with another.
Man is the only animal that can be skinned more than once.
It is just like man's vanity and impertinence to call an animal dumb because it is dumb to his dull perceptions.
Man is the only animal that blushes - or needs to.
Man is by nature a political animal.
Man is the only animal capable of reasoning, though many others possess the faculty of memory and instruction in common with him.
Man is a wingless animal with two feet and flat nails.
Man seems to be the only animal whose food soils him, making necessary much washing and shield-like bibs and napkins. Moles living in the earth and eating slimy worms are yet as clean as seals or fishes, whose lives are one perpetual wash.
Humans are amphibians - half spirit and half animal. As spirits they belong to the eternal world, but as animals they inhabit time.
Experience demands that man is the only animal which devours his own kind, for I can apply no milder term to the general prey of the rich on the poor.
A black cat crossing your path signifies that the animal is going somewhere.
We are certainly in a common class with the beasts; every action of animal life is concerned with seeking bodily pleasure and avoiding pain.
The human animal cannot be trusted for anything good except en masse. The combined thought and action of the whole people of any race, creed or nationality, will always point in the right direction.
For many people who are so lost in their minds, so much involved in their thought processes, the only moments they have when they are not trapped in that is when they are relating to their animal, their pet.
The capacity of human beings to bore one another seems to be vastly greater than that of any other animal.
A politician is an animal which can sit on a fence and yet keep both ears to the ground.