The last volume in the series covers the shearwaters. The guide has over 430 pages of detailed and original text and over 550 color photos, some full-page, the vast majority previously unpublished. Renowned bird artist and illustrator John Gale has contributed over 150 color illustrations. The large-format color range maps are based on the latest geolocator and observational studies, with over 500 references indicating extensive research. In contrast to the previous three books, which included DVDs, this volume includes a USB memory stick with over two hours of highly informative footage with running notes.
Volume 4 of this multimedia identification guide covers the following species: Great Shearwarer, Buller's Shearwater, Sooty Shearwater, Short-tailed Shearwater, Flesh-footed Shearwater, Wedge-tailed Shearwater, Cory's Shearwater, Scopoli's Shearwater, Cape Verde Shearwater, Streaked Shearwater, Persian Shearwater, Manx Shearwater, Yelkouan Shcarwaler, 'Menorcan Shearwater', Balearic Shearwater, Barolo Shearwater, Boyd's Shearwater, Audubon's Shearwater, Jouanin's Petrel, and White-chinned Petrel.