Question

Why the books authored by him are called a Bible for bird watchers?​

Answer 1

Birdwatching, or birding, is a form of wildlife observation in which the observation of birds is a recreational activity or citizen science.

Answer 2

Explanation:

JONATHAN ALDERFER, writer, editor, and illustrator, contributed extensively to several editions of the National Geographic Field Guide to the Birds of North America and co-authored the sixth edition with John L. Dunn, as well as contributing 60 new illustrations to it. He has served on the Maryland/District of Columbia Bird Records Committee and as associate editor of the American Birding Association's magazine Birding. He is a frequent speaker on radio and in workshops on birding and bird illustration. The author lives in Washington, D.C.