CHICAGO -- Charlie Jacobsma slapped the surface of a pool enclosure at Chicago’s Shedd Aquarium and scanned the water for ...

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 ...

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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.