Nature is indifferent to the survival of the human species, including Americans.
Adlai E. Stevenson

Of all the species of literary composition, perhaps biography is the most delightful. The attention concentrated on one individual gives a unity to the materials of which it is composed, which is wanting in general history.
Robert Hall

On the ordinary view of each species having been independently created, we gain no scientific explanation.
Charles Darwin

One has children in the expectation of dying before them. In fact, you want to make damn sure you die before them, just as you plant a tree or build a house knowing, hoping that it will outlive you. That's how the human species has done as well as it has.
Christopher Hitchens

Our climate is changing. The Earth's climate has, in fact, warmed by 1.1 to 1.6 degrees Fahrenheit since the industrial revolution. People look at this and say: Oh, that is not very much. In fact, it is very much, and it changes the dynamic. It impacts species. It kills some. It diminishes the carbon sink of the ocean. It does a number of things.
Diane Feinstein

Our species is on the verge of changes that will fundamentally alter what it means to be human... and we are the people driving that change.
Daniel Keys Moran

Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works.
Carl Sagan

Park women, properly so called, are those degraded creatures, utterly lost to all sense of shame, who wander about the paths most frequented after nightfall in the Parks, and consent to any species of humiliation for the sake of acquiring a few shillings.
Henry Mayhew

People will be fascinated. We will think of each other in a far more homogeneous way, because we will know that there is something that is different from us. And when we say 'us,' it will mean as a species.
Dwight Schultz

Producer's Surplus is a convenient name for the genus of which the rent of land is the leading species.
Alfred Marshall

Removing substantial fuel loads from our forests helps prevent catastrophic fire and better protects species, watersheds and neighboring communities that call them home.
Greg Walden

Sight and touch, being thus increased in capacity, might belong to some species far superior to man; or rather the human species would be far different had all the senses been thus improved.
Jean Anthelme Brillat-Savarin

Species can be recognized by their morphological characteristics and songs.
Peter R. Grant

Species go extinct because there are historical contraints built into a given body or a given design.
Kevin Kelly

Take care, be kind, be considerate of other people and other species, and be loving.
John Lithgow

Take the crocodile, for example, my favorite animal. There are 23 species. Seventeen of those species are rare or endangered. They're on the way out, no matter what anyone does or says, you know.
Steve Irwin

Taught to regard a part of our own Species in the most abject and contemptible Degree below us, we lose that Idea of the dignity of Man which the Hand of Nature had implanted in us, for great and useful purposes.
George Mason

That the variability of an organism to a certain extent is a constant and certain condition of life we admit, otherwise there would be no distinguishable individuals of a species.
Richard Owen

The British ballads became a new kind of form in their hand. And out of them came the blues, a new kind of song of commentary and satire, a song form which, after all, has become the main musical form of the whole human species.
Alan Lomax

The egg of every species of animal or plant carries a definite number of bodies called chromosomes. The sperm carries the same number. Consequently, when the sperm unites with the egg, the fertilized egg will contain the double number of chromosomes.
Thomas Hunt Morgan