Researcher Tiina Jaaskelainen points out a possible sighting of wildlife aboard the Finnish icebreaker MSV Nordica as it traverses the Northwest Passage through the Canadian Arctic Archipelago, Saturday, July 22, 2017. As the icebreaker entered Victoria Strait, deep inside the Northwest Passage, those onboard looked for a shadow moving in the distance or a flash of pale yellow in the expanse of white that would signal the presence of the world's largest land predator. (AP Photo/David Goldman)
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