There is a common but often unspoken arrogance on the part of outside observers that folk science and traditional knowledge--the type developed by Native communities and tribal groups--is inferior to the "formal science" practiced by Westerners. In this lucidly written and humanistic account of the O'odham tribes of Arizona and Northwest Mexico, ethnobiologist Amadeo M. Rea exposes the limitations of this assumption by exploring the rich ornithology...