A third beluga whale has died at a Chicago aquarium after being rescued from a shuttered Canadian marine park — marking the fourth Great White North rescue to die.

Osiris, a 26-year-old female, started experiencing “behavior and respiratory patterns” Monday morning at the Shedd Aquarium in Chicago when staff moved her to a medical tent, the aquarium said in a statement.

Her condition deteriorated quickly before the beluga’s death, despite “lifesaving efforts” from the aquarium’s veterinary and animal care teams.

The whale’s cause of death is not yet known and a full necropsy will be conducted.

Osiris was one of 10 whales rescued from the defunct…

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