Great Slaty Woodpecker 
(Gõ kiến xám, Mulleripicus pulverulentus)

The great slaty woodpecker (Mulleripicus pulverulentus) is a species of bird in the family Picidae.

The genus name Mulleripicus honours the German naturalist Salomon Müller.
pulverulenta, pulverulentus: Latin pulverulentus dusty, powdered (from pulvis dust).