Land bridges were everywhere during the extinction, many species were spreading, and there were many diseases.
Robert T. Bakker

Laughter is one of the very privileges of reason, being confined to the human species.
Thomas Carlyle

Let us beware of saying that death is the opposite of life. The living being is only a species of the dead, and a very rare species.
Friedrich Nietzsche

Living wild species are like a library of books still unread. Our heedless destruction of them is akin to burning the library without ever having read its books.
John Dingell

Long after this wonderful event in the Earth's history, when the human species was spread over a good deal of Asia, Europe, and Africa, migration to the American continents began in attempts to find new feeding grounds and unoccupied areas for hunting and fishing.
Harry Johnston

Love is only a dirty trick played on us to achieve continuation of the species.
W. Somerset Maugham

Man is more than merely an animal to exist and propagate his species. His mind gives him capacity to search out the great truths in God's arrangement and this lifts him far above the other animal creation.
Joseph Franklin Rutherford

Mankind is considered (by the radical environmentalists) the lowest and the meanest of all species and is blamed for everything.
Dixie Lee Ray

Married people from my generation are like an endangered species!
Patrice Leconte

Measles and TB evolved from diseases of our cattle, influenza from a disease of pigs, and smallpox possibly from a disease of camels. The Americas had very few native domesticated animal species from which humans could acquire such diseases.
Jared Diamond

Men and women belong to different species and communications between them is still in its infancy.
Bill Cosby

Moreover, all our knowledge of organic remains teaches us, that species have a definite existence, and a centralization in geological time as well as in geographical space, and that no species is repeated in time.
Edward Forbes

Moreover, the concern of some that moving DNA among species would breach customary breeding barriers and have profound effects on natural evolutionary processes has substantially disappeared as the science revealed that such exchanges occur in nature.
Paul Berg

Most of them are doomed to rapid extinction, but a few may make evolutionary inventions, such as physiological, ecological, or behavioral innovations that give these species improved competitive potential.
Ernst Mayr

Mr. Darwin refers to the multitude of the individual of every species, which, from one cause or another, perish either before, or soon after attaining maturity.
Richard Owen

My first attempts to transmit typhus to laboratory animals, including the smaller species of monkeys, had failed, as had those of my predecessors, for reasons which I can easily supply today.
Charles Jules Henry Nicole

Nature is a collective idea, and, though its essence exist in each individual of the species, can never in its perfection inhabit a single object.
Henry Fuseli

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