The Symbolic Species: The co-evolution of Language and the Brain.
By Terrence W. Deacon.
From Chapter 1: An Evolutionary Anomaly. “As our species designation--sapiens-suggests, the defining attribute of human beings is an unparalleled cognitive ability. We think differtently from all other creatures on earth, and we can share those thoughts with one another in ways that no other species even approaches. In comparison, the rest of our biology is almost incidental. Hundreds of millions of years of evolution have produced hundreds of thousands of species with brains, and tens of thousands with complex behavioral, perceptual, and learning abilities. Only one of these has ever wondered about its place in the world, because only one evolved the ability to do so….”
NY. W.W.Norton.1997. 5128p.