This book outlines the principles of flight, of birds in particular. It describes a way of simplifying the mechanics of flight into a practical computer program

Twenty-four realistic, full-color paper bird models couldn't be easier to make, and they really fly! Simply press along perforations, fold, and add a penny for

Birds fly very efficiently, doing little work themselves, and gaining large amounts of energy from the atmosphere. Whether on local flights or migration, they h

An introduction to the science that explains how birds fly.