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Excerpt from The Biology of Birds
The aim of this book, like that of the others in the series, is to illustrate biological ideas in reference to a particular group or class Of animals. In this case the selected class is that of birds, and the book applies to these fascinating creatures such biological concepts as adaptation, struggle, sex, heredity, variation, selec tion, and behaviour.
There are many students of birds who are expert along particular lines, having, for instance, a personal familiarity with British birds and their ways, or an accurate knowledge of birds' bones or birds' eggs, or a detailed acquaintance with what is known in regard to distribution, migration, and the nature of the food, or a quite remarkable eye for ¿ight, and ear for song. We have had the pleasure of learning much from some of these experts, a pleasure all the greater be cause the lover of birds is usually a delightful person to meet; perhaps we shall not be misunderstood if we say that this book is an attempt to unite all the specialisms in an amalgam of biological ideas.
For those who have the good fortune to be nearer the beginning than the end of their studies, our book may be, we hope, of use in suggesting the length and breadth, the depth and height of the Biology of Birds.
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