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Just as the supposed number may differ from the true number by fully 100, 150, or even 200 in a flock of 600 sheep, so may I be even more out of my reckoning in the case of these very little animalcules.

Most people don't realize it, because they're invisible, but microbes make up about a half of the Earth's biomass, whereas all animals only make up about one one-thousandth of all the biomass.

It's fair to say when you go out and walk in the woods or on a beach, the most conspicuous forms of life you will see are plants and animals, and certainly there's a huge diversity of those types of organisms, perhaps 10 million animal species and several hundred thousand plant species.

There are some four million different kinds of animals and plants in the world. Four million different solutions to the problems of staying alive.

In a few generations more, there will probably be no room at all allowed for animals on the earth: no need of them, no toleration of them.

You see, every creature alive on the earth today represents an unbroken line of life that stretches back to the first primitive organism to appear on this planet; and that is about three billion years.

A cat, I am told, has nine lives. If that is true, I know how a cat feels.

Statistics show that of those who contract the habit of eating, very few survive.

Dogs get lost hundreds of times and no one ever notices it or sends an account of it to a scientific magazine.

I had a ton of animals; I had a goat growing up, a bunch of rabbits, a vegetable garden.