Forty Years Notes Of A Field Ornithologist is a book written by John Krider in 1878. This book is a detailed record of Krider's experiences as a field ornithologist for forty years. It contains a wealth of information about birds, their habitats, behavior, and migration patterns. Krider's observations are based on his extensive travels throughout North America, where he studied and documented the avian fauna of the continent.The book is divided into...