Episode 8: Face the Face Along The Backbone

    • Naturwissenschaften

Of all the vertebrate animals, only mammals have muscles of facial expression ... why?

  • Creative Commons: Attribution-NonCommercial-NoDerivs 3.0 Unported (CC BY-NC-ND 3.0)

Of all the vertebrate animals, only mammals have muscles of facial expression ... why?

  • Creative Commons: Attribution-NonCommercial-NoDerivs 3.0 Unported (CC BY-NC-ND 3.0)