Killer whales are expanding their territory and have moved into Arctic waters as climate change melts sea ice, with two genetically distinct populations being identified by Canadian scientists.

Killer whales are shown in the Eastern Canadian Arctic in this undated handout photo. Killer whales are expanding their territory and have moved into Arctic waters as climate change melts sea ice ...

It says killer whales in the eastern Canadian Arctic have been observed preying mostly on beluga whales and narwhals, followed by bowhead whales and seals. "We think there's going to be a big change ...

It says killer whales in the eastern Canadian Arctic have been observed preying mostly on beluga whales and narwhals, followed by bowhead whales and seals. “We think there’s going to be a big change ...