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Ruuhkatukka t1_j116vot wrote

Interesting. So there were river based sub species at some point? I don't know much about seals but I was always fascinated by the sub species that lives in lake Saimaa here in Finland.

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onioning t1_j117x28 wrote

This is all speculation. Just perhaps the most plausible explanation. There's literally no evidence of river going seals up there. Though that doesn't at all mean it didn't happen. Finding a river going ancestor somewhere would change things, but the fossil record can be really cruel sometimes.

If they came from the West this problem doesn't exist, because that would be a voyage of shorter rivers between larger bodies of water.

There's a good YouTube video on this. Can't recall if it's PBS or Moth Light Media or someone else, but details the various theories.

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