Take a note, Bubbles
According to a recent post on Language Log, chimpanzees in the wild have been observed make pencil-like tools. They take sticks, tear off any branches, peel the bark off, and then sharpen one end. They then use the stick to make mark on large flat leaves. In one cases, a female chimp made marks on a leaf, showed it to a male, who looked at it briefly, then rushed off on some errand. Researchers have, as yet, been unable to examine the symbols because the chimps eat usually them.
Perhaps writing has been around a lot longer than we realise.