Answer:
I walk on 4 legs in the morning 2 legs at noon and 3 legs at night.
I have three heads. Cut off one I become stronger. Cut off two I become ten.
By myself, I'm practically nothing. Worthless as a leader, but when I follow a group, their strength increases tenfold. What am I?
You throw me away, I find my way back. Traditionally, I'm wooden with an arch in my back. What am I?
What is so delicate that saying its name breaks it?
No matter how little or how much you use me, you change me every month.