The animal tends to eat with his stomach, and the man with his brain. When the animal's stomach is full, he stops eating, but the man is never sure when to stop. When he has eaten as much as his belly can take, he still feels empty, he still feels an urge for further gratification.
For the real difference between humans and other animals is that humans alone have perception of good and evil, just and unjust, etc. It is the sharing of a common view in these matters that makes a household and a state.
Without enough wilderness America will change. Democracy, with its myriad personalities and increasing sophistication, must be fibred and vitalized by regular contact with outdoor growths - animals, trees, sun warmth and free skies - or it will dwindle and pale.
The poise of a plant, the bended tree recovering itself from the strong wind, the vital resources of every vegetable and animal, are also demonstrations of the self-sufficing, and therefore self-relying soul. All history from its highest to its trivial passages is the various record of this power.
The male has more teeth than the female in mankind, and sheep and goats, and swine. This has not been observed in other animals. Those persons which have the greatest number of teeth are the longest lived; those which have them widely separated, smaller, and more scattered, are generally more short lived.
Please also remember the pitiful gasping/thirsty little mouths/ beaks in summer. They'll appreciate abundant/fresh/cool/clean/ water! Food they can get easily in parks/sidewalks!
We are the product of 4.5 billion years of fortuitous, slow biological evolution. There is no reason to think that the evolutionary process has stopped. Man is a transitional animal. He is not the climax of creation.
The Animals of the planet are in desperate peril and they are fully aware of this. No less than human beings are doing in all parts of the world, they are seeking sanctuary.