With Arctic sea ice shrinking at record levels due to global warming, killer whales are expanding their hunting grounds further north and spending more time in polar waters, US scientists say.
Increasingly frequent and northerly sightings suggest that the iconic black and white member of the dolphin family, whose males can grow up to eight metres long and weigh six tonnes, is learning to adapt to the newly melted waters of the Arctic Ocean. In the waters off Greenland's capital Nuuk, four orcas, considered an unwelcome competitor by local fishermen and hunters, were killed at the end of November, an act permissible under Greenlandic law.A University of Washington study presented at the beginning of December found that the increased migration of super predators is a consequence of the increasingly long season when the Arctic Ocean is free of ice.
Arctic sea ice, which is also getting thinner, has shrunk on average by more than 13 percent per decade over the past 40 years.
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