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Until recently, gulls were a group that inspired dread among birders, due to the bewildering variety of plumage, age groups, and races, many of which are very difficult indeed to separate, even to species. Things changed in 2003 with the publication of Klaus Malling Olsen's Gulls of Europe, Asia and North America, a plate-based title that made accurate identification of gulls a realistic possibility for the first time. Gulls of the World is a companion and successor to that seminal work.

This photographic identification guide covers all of the world's gull species,...

Skuas (and jaegers) are a fascinating and popular group of seabirds that make up a subfamily of just seven species. They can be divided into two main groups: the larger species of Catharacta skuas which are mainly found in the southern hemisphere (with Great Skua breeding in the north), and the three Stercorarius species (also known as jaegers) which breed in the northern hemisphere. Both northern and southern skuas breed at high latitudes and several species are long-distance migrants, performing spectacular migrations through most of the world's oceans, sometimes even flying...