It seems throwing and language are intertwined. It's a wild thought: that throwing something at someone in your group may have been one of the first forms of communication -- a comment of sorts. Looking at today's chimps, they found that those who threw the most stuff, and threw it more accurately than their pals, also showed increased activity in the left hemisphere of the brain, where speech is processed.
I love the idea that throwing and language are related. It's so unexpected. This is another sign that we know next to nothing about our own brains. That's because we are an infant race. Too bad we have nukes, huh?
PS: This is a fun story too: Hive mind to sort out whale sounds.