Woodpeckers, which normally use their beak to dig for food, are the percussionists of the avian world, signaling other birds by pounding their beak on a resonant hollow log or branch.
Dzeņi, kuriem knābis pirmām kārtām ir noderīgs darbarīks, kas palīdz iegūt barību, ir putnu pasaules lielākie bundzinieki.