• Wood pecker has elongated straight and stout chisel like beak for drilling into the bark or wood and feeding on insect larvae or for nest construction.

• Its long tongue has a barbed tip and is conserved in sticky saliva. This helps the bird in capturing and extracting insect from holes made on bark or wood.

• Its thick spongy skull absorbs the impact of repeated drilling. The skull fit very tightly around brain and prevents brain damage.

• Feet are used as grasping organ and are specially adapted for climbing vertical surface.

• Sharp claws, specially arranged toes and short legs collectively help wood peckers to tightly cling to vertical wood and surfaces.

• The toe arrangement of wood pecker is called Zygodactylous, where the first and 4th toe are pointed backward and others forwarded.