Otters can flourish anywhere there are fish. At first glance the photo of those three otters in the snow seems to disprove that. That was a cold day and there weren't even snowfleas around. However, the otters were sticking their heads out of a hole in the ice of a pond. Underneath the ice, this is something like what they saw:
and that channel may have led to an area under the ice looking like this (though the camera flash is a luxury otters don't have!)
little pools of water, lightly frozen over, where they could find fish to eat -- and it was probably quite a bit warmer under that ice especially when the sun went down. So otters live in two different worlds, no actually three: the dry one we are familiar with, the under water world and the under ice world. In the latter two they get most of their food. They do need dry land, though. Otters, not just sea otters, can fish many miles out in the ocean but they have to come back to dry land where they can wash off in fresh water, rest, and raise a family.
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