The evolutionary puzzle of the mammalian ear

How could the tiny parts of the ear adapt independently to the diverse functional and environmental regimes encountered in mammals? A group of researchers from the University of Vienna and the Konrad Lorenz Institute for Evolution and Cognition Research proposed a new explanation for this puzzle. They suggest that the incorporation of the bones of the primary jaw joint into the ear has considerably increased the genetic, regulatory, and developmental complexity of the mammalian ear.