Due the ambiguous status of the Ivory-billed Woodpecker (S.E. United States), the Great Slaty Mulleripicus pulverulentus lays claim to the title of the world’s largest woodpecker.   Usually in pairs or family groups, this bird forages in the upper canopy of lowland primary forest and at times in riverine forest.  When in flight or moving around tree branches, it utters a loud and bubbly call.  Found in S.E. Asia to eastern Himalayas.