New Protocetid Whale from the Middle Eocene of Pakistan: Birth on Land, Precocial Development, and Sexual Dimorphism Gingerich, Philip D. ; ul-Haq, Munir ; von Koenigswald, Wighart ; Sanders, William J. ; Smith, B. Holly ; Zalmout, Iyad S. Abstract Publication: PLoS ONE Pub Date: February 2009 DOI: 10.1371/journal.pone.0004366 Bibcode: 2009PLoSO...4.4366G