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We present the first review of the development and spread of the IBA concept since it was launched by BirdLife International (then ICBP) in 1979 and examine some of the characteristics of the resulting inventory. Over 13,000 global and regional IBAs have so far been identified and documented in terrestrial, freshwater and marine ecosystems in almost all of the world\u2019s countries and territories, making this the largest global network of sites of significance for biodiversity. IBAs have been identified using standardised, data-driven criteria that have been developed and applied at global and regional levels. These criteria capture multiple dimensions of a site\u2019s significance for avian biodiversity and relate to populations of globally threatened species (68.6% of the 10,746 IBAs that meet global criteria), restricted-range species (25.4%), biome-restricted species (27.5%) and congregatory species (50.3%); many global IBAs (52.7%) trigger two or more of these criteria. IBAs range in size from &lt; 1 km<jats:sup>2<\/jats:sup> to over 300,000 km<jats:sup>2<\/jats:sup> and have an approximately log-normal size distribution (median = 125.0 km<jats:sup>2<\/jats:sup>, mean = 1,202.6 km<jats:sup>2<\/jats:sup>). They cover approximately 6.7% of the terrestrial, 1.6% of the marine and 3.1% of the total surface area of the Earth. The launch in 2016 of the KBA Global Standard, which aims to identify, document and conserve sites that contribute to the global persistence of wider biodiversity, and whose criteria for site identification build on those developed for IBAs, is a logical evolution of the IBA concept. The role of IBAs in conservation planning, policy and practice is reviewed elsewhere. Future technical priorities for the IBA initiative include completion of the global inventory, particularly in the marine environment, keeping the dataset up to date, and improving the systematic monitoring of these sites.<\/jats:p>","DOI":"10.1017\/s0959270918000102","type":"journal-article","created":{"date-parts":[[2018,10,23]],"date-time":"2018-10-23T07:04:14Z","timestamp":1540278254000},"page":"177-198","source":"Crossref","is-referenced-by-count":146,"title":["Important Bird and Biodiversity Areas (IBAs): the development and characteristics of a global inventory of key sites for biodiversity"],"prefix":"10.1017","volume":"29","author":[{"given":"PAUL F.","family":"DONALD","sequence":"first","affiliation":[]},{"given":"LINCOLN D. 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M.","family":"BUTCHART","sequence":"additional","affiliation":[]},{"given":"SOFIA","family":"CAPELLAN","sequence":"additional","affiliation":[]},{"given":"MICHAEL J.","family":"CROSBY","sequence":"additional","affiliation":[]},{"given":"MARIA P.","family":"DIAS","sequence":"additional","affiliation":[]},{"given":"DAVID","family":"DIAZ","sequence":"additional","affiliation":[]},{"given":"MICHAEL I.","family":"EVANS","sequence":"additional","affiliation":[]},{"given":"RICHARD","family":"GRIMMETT","sequence":"additional","affiliation":[]},{"given":"MELANIE","family":"HEATH","sequence":"additional","affiliation":[]},{"given":"VICTORIA R.","family":"JONES","sequence":"additional","affiliation":[]},{"given":"BENJAMIN G.","family":"LASCELLES","sequence":"additional","affiliation":[]},{"given":"JENNIFER C.","family":"MERRIMAN","sequence":"additional","affiliation":[]},{"given":"MARK","family":"O\u2019BRIEN","sequence":"additional","affiliation":[]},{"given":"IV\u00c1N","family":"RAM\u00cdREZ","sequence":"additional","affiliation":[]},{"given":"ZOLTAN","family":"WALICZKY","sequence":"additional","affiliation":[]},{"given":"DAVID C.","family":"WEGE","sequence":"additional","affiliation":[]}],"member":"56","published-online":{"date-parts":[[2018,10,23]]},"reference":[{"key":"S0959270918000102_ref53","volume-title":"Hotspots revisited: Earth\u2019s biologically richest and most endangered terrestrial ecoregions","author":"Mittermeier","year":"2004"},{"key":"S0959270918000102_ref52","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0101717"},{"key":"S0959270918000102_ref48","doi-asserted-by":"publisher","DOI":"10.1016\/j.biocon.2011.12.008"},{"key":"S0959270918000102_ref46","doi-asserted-by":"publisher","DOI":"10.1016\/j.biocon.2016.08.010"},{"key":"S0959270918000102_ref41","first-page":"305","article-title":"Towards a management framework for protected area networks in the face of climate change","volume":"25","author":"Hole","year":"2011","journal-title":"Conserv. 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