494KiB, 1898x1800, Archaeocete Crania.jpg View SameGoogleiqdbSauceNAO Cetacean Evolution Anonymous Mon 10 Aug 03:52:52 2020 No.11992620 ViewReplyOriginalReport Quoted By: >>11993108 What exactly spurred their development in the first place? Was it simply a generalized group of animals exploiting open niches like other ungulates were doing on land, or was there some other cause?
