Some of my doubts are answered when I got the chance upon a Rufous Woodpecker (Celeus brachyurus). The woodpecker start to peck on the branch and after a while, it uses the tongue to do the finishing kill.
**Thank you YC for the link... "The woodpecker’s tongue is its most important tool when probing for larvae. It is extremely long, has specialised muscles that enable the bird to extend and retract it with ease, and the tip is covered with backward-pointing barbs. At the same time there are glands that secrete a sticky fluid. All these adaptations allow the bird to locate larvae hidden inside rotten wood and once located, to extract them."