The manatee swims relatively slowly for a sea creature, isn’t very large, and survived quite nicely till man started killing them.
Not saying we come from manatee, just an example of a creature that lives with the restraints in your first comment.
Also, man, if evolved on land or sea, he lived for a long time among animals much more powerful than himself.
As far as diet, I would assume fish, personally.
I'm not saying aquatic ape is right, just points to ponder.
Just open the box and see
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