Many important biological problems are concerned with birth, death, and population change - the basis of classical demographic research. Yet few biologists are aware that the well-developed principles of human demography can be applied to biological problems. This book introduces biologists to population studies and shows how to apply demographic principles and techniques in research. It outlines general principles - life tables, growth models, stable population theory - and provides examples from entomology. The book is based on the author's insect demography course at the University of California, Davis. It is intended as a reference handbook for ecologists, population biologists, and entomologists, and as a graduate text in basic demography for advanced biology and ecology students.