No part of the world can be truly understood without a knowledge of its garment of vegetation, for this determines not only the nature of the animal inhabitants but also the occupations of the majority of human beings.

When we see animals doing remarkable things, how do we know if we're simply seeing tricks or signs of real intelligence? Are talented animals just obeying commands, or do they have some kind of deeper understanding? One of the biggest challenges for animal researchers is to come up with tests that can distinguish between the two.

I think that animals aren't less intelligent than humans, they're just of a different intelligence. We have five million smell-sensitive cells in our nose, they have two hundred and fifty million - they can smell emotion. They can smell different types of emotion, they just have another type of intelligence.

I think there's a supreme power behind the whole thing, an intelligence. Look at all of the instincts of nature, both animals and plants, the very ingenious ways they survive. If you cut yourself, you don't have to think about it.

Human folk are as a matter of fact eager to find intelligence in animals.

From the lowest animals of which we can affirm intelligence up to man this type of intellect is found.

What happens if you stick at something long enough, and study it for so long, you have a different kind of intelligence. It's not an intellectual thing. It's almost like an animal intelligence. I call it our form of instinct, almost how a lion knows exactly where its prey is.

I do not want to go into its physical reasons: the construction of the human body is different from that of carnivorous animals. But man's intelligence is such that it can be utilised to defend any-thing he does, whether right or wrong.

The intelligence of the lower forms of animal life, like a great deal of human intelligence, does not involve a self.

I think that intelligence is such a narrow branch of the tree of life - this branch of primates we call humans. No other animal, by our definition, can be considered intelligent. So intelligence can't be all that important for survival, because there are so many animals that don't have what we call intelligence, and they're surviving just fine.

If an animal does something, we call it instinct; if we do the same thing for the same reason, we call it intelligence.

Independence is all very well, but we animals never allow our friends to make fools of themselves beyond a certain limit; and that limit you've reached.

The human mind evolved always in the company of the human body, and of the animal body before it was human. The intricate connections of mind and body must exceed our imagination, as from our point of view we are peculiarly prevented from observing them.

If a dog doesn't put you first where are you both? In what relation? A dog needs God. It lives by your glances, your wishes. It even shares your humor. This happens about the fifth year. If it doesn't happen you are only keeping an animal.

I hope to make people realize how totally helpless animals are, how dependent on us, trusting as a child must that we will be kind and take care of their needs.

Nor dread nor hope attend a dying animal; a man awaits his end dreading and hoping all.

It's interesting. People go to an animal shelter and pick a dog that's been kicked, beaten, and has lost a leg and an eye, and they'll take that dog home and give it love and support, but they don't do that with people.

Nature promotes mutualism. The flower nourishes the bee. The river waters quench the thirst of all living beings. And trees provide a welcoming home to so many birds and animals. There is a rhythm to this togetherness.

I'm lucky because I have a job I love. I really miss being away from home, being in my own bed, seeing my animals and siblings, having my moms cookies. I have a couple cats. I got a kitten about a year ago and now Im going on the road so I wont see him for a while. I feel bad.

The history of agriculture is the history of humans breeding seeds and animals to produce traits we want in our crops and livestock.

Mainly I'm a vegan because I like animals, and I don't want to be involved in their suffering. Also, it's better for my health and for the environment.

Well I think on a simple ecological level that the diversity of this planet is important for our survival, that all of our different cultures, people are important to the health of the whole the same way that a species of animal should be saved and at a simple ecology level.

I'm not into animal rights. I'm only into animal welfare and health. I've been with the Morris Animal Foundation since the '70s. We're a health organization. We fund campaign health studies for dogs, cats, lizards and wildlife. I've worked with the L.A. Zoo for about the same length of time. I get my animal fixes!

As long as man continues to be the ruthless destroyer of lower living beings he will never know health or peace. For as long as men massacre animals, they will kill each other.