One day, the tribe of Satyrs were collecting crops when one was approached by wizard. His name was Paullie, he was the runt of the litter and felt he needed to prove himself. So he traded his lot of crops for magic gum.
He was sure of the decision he had made that without speaking to anyone he doused the food with bits of the gum.
After there meal they went back to finish there work for the night. On the way outside the feel a tightness in their face and they are unable to open their mouths.
They tried for hours to break their mouths' free of the gum's hold. They were unable to communicate with one another, but they realized it must have been their meal. The meal Paullie had overseen.
He went to the fire pit that evening cold and alone. He waved over the birds, he enjoyed the company even if they had nothing to say. It was then that a brilliant idea came to him
He went to sleep that night eager to tell his friends how he had solved their problem.
He gathered them down to the sand path, once there he explained his new idea. Sign Language. It slowly evolved into what we know today.