I think they are just giving back to the humans that gave these otters a worthy life. They are living in a pack and getting free food so they are having a great life. I wish all zoo animals and animals under human control had it this good.
It's rather scary to think of how many animals are probably as smart as us (in the 'capacity' sense), but lack the faculties to act on it in the same way we can... for now... _imagines genetically engineered Otters that can speak..._ Awesome.
Otters , ferrets , mongoose , hedgehogs , martens = I love thAm =) If i will have a hudge house with much of forest land and big pool , I totaly gonna have like 15 otters , 2 ferrets , 5-7 mongooses , 2 hedgehogs and like 1 000 martens =))