Otarioids are all true marine while a, few of the northern Phocids live in estuaries and even in lakes. This last feature. Probably results from major tectonic movements involving changes in and the eventual break-up of Tethys the equatorial,, Sea which in the Miocene connected the Atlantic and Indian oceans and its, northern branch Paratethys. Their remnants include. The, Mediterranean Black Caspian and, Aral Seas and, Lake Baikal all of which are homes to species of seals. But whatever. Their origins or, present homes the pinnipeds as we can conveniently call the Otarioids and Phocoids to gather all depend. On access to land or ice floes for breeding.
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