a downy woodpecker pecking a hole in a peeling birch tree tree

woodpecker bark american white birch downy hairy canoe cavity hole animal behavior wild wildlife avian barred betula papyrifera bird watching birding birdwatching bite black blue brown chip dangle fauna flake forest gap hang hanging hardwood hollowedout people one opening ornithology paper passerine peck peel peeling single solitary songbird strike striped tree canopy wood wooden woodland illinois kankakee county state park picoides pubescens united states pecking pecks tree fit head insid ethe