If language naturally evolves to serve the needs of tiny rodents with tiny rodent brains, then what's unique about language isn't the brilliant humans who invented it to communicate high-level abstract thoughts. What's unique about language is that the creatures who develop it are highly vulnerable to being eaten.
Temple Grandin, Catherine Johnson (2009). “Animals in Translation: Using the Mysteries of Autism to Decode Animal Behavior”, p.313, Simon and Schuster
