white-backed woodpecker

birchbark silver bark extracts larvae borers trunk tree forest pests barkeating borer beetle larva bird caucasian endemics caucasus dendrocopos leucotis management medics forestry fowl garden jerk nature pecker peckerwood pinhole pound rare woodpecker sick silviculture spotted timberworm birds watching wild woodborer wooddestroying insect hollowing whitebacked leucotos cavity nesters wood hewers picidae white-backed beautiful detached birch male juv