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on the topic of different unrelated aquatic mammals wasn't there also one marsupial that became aquatic and is notable as the ONLY semiaquatic marsupial?

somehow it gets past the whole "babies might drown in the pouch" issue

yeah, the yapok! it's native to mexico and central america, and it's the result of the north american branch of opossums trying to make an otter and mostly succeeding :)

there are many many MANY partially-aquatic mammals out there, but only a few totally-aquatic marine mammals.