Polar bears - thoughtful giants that gave us the once-over with sniff tests or penetrating stares,  Once satisfied that neither human nor zodiak posed a threat, the bears pursued their own agendas - napping, hunting, and thinking, lots of thinking.  
   
Walruses -  lightening fast and graceful in the water, they did not hesitate to send greeting parties toward the zodiak at each opportunity. Even though less nimble on land, their sheer size and magnificent tusks, left no doubt that a tangle with an angry walrus could go very badly for human or beast.