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, tackling some of the stiffest ID challenges in birding. Concise text places particular emphasis placed on field identification, with detailed discussion of variation, and there is coverage of habitat, status, and distribution. The text is followed by a series of high-quality photographs, carefully selected to highlight identification criteria and, crucially, to allow age and sub-specific separation in the field. The species entries are complemented by an accurate color range map.
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La guía fotográfica definitiva sobre todas las especies de gaviotas del mundo.
Esta obra es la sucesora de la guía de gaviotas de Europa, Asia y Norteamérica del mismo autor, Klaus Malling Olsen. Esta guía de identificación fotográfica cubre todas las especies de gaviotas del mundo, enfrentándose por tanto a algunos de los mayores desafíos de la identificación de aves. Los textos, concisos, hacen especial énfasis en la identificación de campo, discutiendo detalladamente la variación de los plumajes, además de comentar los hábitats, estatus y distribución. El texto es seguido por una serie de fotografías de alta calidad, cuidadosamente seleccionadas para poner de relieve los criterios clave para la identificación y, sobre todo, para permitir separar edades y subespecies.