Adult Quote by Peter R. Grant

“Causes of Variability — Effects of Habit and the use and disuse of Parts — Correlated Variation — Inheritance — Character of Domestic Varieties…

— Charles Darwin

As many more individuals of each species are born than can possibly survive; and as, consequently, there is a frequently recurring struggle for existence,…

— Charles Darwin

“Just as the migratory and nest-building instincts of birds were never learnt or acquired individually, man brings with him at birth the ground-plan of…

— Murray Stein

On consideration, it is not surprising that Darwin's finches should recognize their own kind primarily by beak characters. The beak is the only prominent…

— David Lack

Bird taxonomy is a difficult field because of the severe anatomical constraints imposed by flight. There are only so many ways to design a…

— Jared Diamond

Evolutionary biologists are not content merely to explain how variation occurs within limits, however. They aspire to answer a much broader question-which is how…

— Phillip E. Johnson

When a trait is universal, evolutionary biologists look for a genetic explanation and wonder how that gene or genes might enhance survival or reproductive…

— Robin Marantz Henig

You are created just right. Each kind of bird has a uniquely-shaped beak, wings, and even feather shape so that everything about it is…

— Anonymous

The basic formulation, or bare-bones mechanics, of natural selection is a disarmingly simple argument, based on three undeniable facts (overproduction of offspring, variation, and…

— Stephen Jay Gould

In the process of natural selection, then, any device that can insert a higher proportion of certain genes into subsequent generations will come to…

— E. O. Wilson

Birds have nests that seem to be inherent. I think there must be some kind of extended phenotype for humans. People probably have, inherently…

— Mitchell Joachim

Different people have different duties assigned them by Nature; Nature has given one the power or the desire to do this, the other that.…

— Henrik Ibsen