On: Humans are more dependent on water than many other...

[Bayart]

Isn't the hair stuff mostly explained by running on two legs and thermal regulation ?

[Scaevolus → Bayart]

Yes. Also, most every mammals other than whales _still_ have fur (seals, sea lions, otters, etc), so it's not clear that hairlessness has strong selection pressure.

[scotty79 → Scaevolus]

When thinking about what water humans had a contact with at one time you should rather think of hippos not otters.

Shalow, warm, maybe even not salty water? It must have been significant food source if we have very specific adaptation to gipping something in water.

[Scaevolus → scotty79]

Pruney fingers are a general primate adaptation, and likely have more to do with not slipping from trees when it rains than any serious aquatic phase.

[scotty79 → Scaevolus]

Not that general. The only other species I can find mentioned to have pruney fingers are macaque monkeys.

And we are unsure if that's a remnant of common ancestor or a parallel evolution.