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Caldecott and Miles, 2005; Bharadwaj, 2006; Maxmen, 2012; LAGA/WCP, 2012; Nijman, 2005a&b; CITES/GRASP, 2006; Redmond, 1989 and personal communication 2013; Tanna, 2012; Ammann, 2011, 2012 and personal communication, 2013.