Brown David Brown 
Draw Birds [PDF ebook] 

These instructional drawing books have a highly visual and practical approach. With the aid of step-by-step drawings, the authors – all professional artists or teachers – explain clearly and concisely how to use pencil, pen and ink, Cont and charcoal.The series covers a comprehensive range of popular subjects and each title contains sections on materials, composition, perspective and different drawing techniques – both traditional and innovative.