At last, larophiles have a portable guide to all the world’s gulls. Recent guides to this subfamily covered only the Northern Hemisphere (Malling Olsen and Larsson 2003, 2004) or the Western Hemisphere (Howell and Dunn 2007). Another recent treatment of identification of the world’s gulls (Burger and Gochfeld 1996), in volume 3 of del Hoyo et al. (1992–2013), was necessarily brief and contained in a volume weighing 4.5 kg, hardly appropriate for field use.