- Author: Mark Elbroch
- ISBN: 9780811726962
- A sighting in the field is just one way birders can identify bird species
- Observant nature-lovers can discover what birds are where by examining tracks, trails, and a variety of bird sign: discarded feathers, feeding leftovers and caches, pellets, nests, droppings, and skulls and bones
- This fully illustrated guide--the first of its kind for North American birds--presents thorough and straightforward instruction for identifying bird families or individual species by careful examination of the unique sign they leave behind
- It also offers keys to the birds' behavior in the wild.