grey-headed woodpecker, picus canus, thailand

birds of thailand asia woodpecker woodpeckers bird in the burrow peckers grey-headed picus canus grey-faced picidae piciformes sand bathing foraging forage forest grounds pecking burrowing afternoon kaeng krachan national park tropical parks wildlife wild nature jungle photography feather perching ornithology watching twitching natural habitat rainforest unesco world heritage bill worms tree feeding