Sibley, D / February 2001 – vol. 94, issue 2, pp 80–84 If you strive to be a better birdwatcher, you have probably spent some time studying the bird-topography diagrams published in books and magazines. A working knowledge of bird topography is essential for describing plumages and for understanding the variation exhibited by birds, but the terminology, particularly in relation to head feathering, is complex and not always easy to understand. In the 1... This article is only available to registered users.To read more, please log in or purchase a subscription.