Killer whale tracked making incredible journey from Arctic to Azores
Researchers say the increase in orca sightings appear to be related to the way the Arctic ice has been retreating in recent years. Orcas tend to steer clear of thick ice.
While climate change is a prime suspect, some have suggested that the increasing number of orcas in the Arctic may be related to the way bowheads have rebounded since the end of commercial whaling.
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