> Primates are relatively unique in their complete lack of innate swimming abilities.

Human babies can swim, so it's maybe more initially an innate one that gets lost. Though they won't be able to keep their head over water by default if that's what you meant (can be trained to as a toddler). But I'm talking about swimming on the umbilical in water births, etc., showing that there isn't a complete lack of innate swimming abilities.