Answer:
They observe how to extract termites from their nest by observing older chimps.
Step-by-step explanation:
Chimps use sticks to extract termites from their nests. They have different techniques and procedures to do it, but they always learn them from observing older chimps since the processes are too complex to find out all by themselves how to do it. When they are young, they grab sticks and poke things with them in a playing manner, but at the same time, they are observing other chimps and imitating them in their actions, which results in them learning how to extract termites.