This book is about importance of animal size. We tend to think of animal function in chemical terms and talk of water, salts, proteins, enzymes, oxygen, energy, and so on. We should not forget, however, that physical laws are equally important, for they determine rates of diffusion and heat transfer, transfer of force and momentum, the strength of structures, the dynamics of locomotion, and other aspects of the functioning of animal bodies. This book aims to give an understanding of these rules because of their implications when we deal with animals of widely different size and scale. Copyright (C) Muze Inc. 2005. For personal use only. All rights reserved.