However, it is probably true that human (or pre-human or proto-human) social history preceded the development of language. That is we may have had more complex social relations than other animals before we developed language. One speculation is that language can *develop* in variety of types of social create, possibly as play among the young, or as jump in complexity of the kind of signals birds and chimps use for differing purposes. But, the speculation goes, such development would only have sufficient advantage to be preserved in a species with complex and social relations that this type of communication makes easier. (I wonder if insect "language" counts as language for these purposes or not. I suspect not but ...) Of course language would then produce a huge leap in social complexity.
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