A third beluga whale rescued from Marineland in Canada has died at the Shedd Aquarium in Chicago. Osiris, a 26-year-old female beluga, passed away just over a month after being rescued. The aquarium described Osiris as a "whale of clinical concern" from the moment she arrived, indicating that she required close medical attention. Each rescued beluga came with unique life history and health needs that were not fully known before their arrival. Osiris showed periods of improvement in nutrition and social behavior, but her condition was continuously monitored. In the days before her death, she exhibited symptoms of dehydration and an electrolyte imbalance, which were improving. She was eating and socializing after treatment, but her condition worsened on Monday, leading to her relocation to a medical habitat. Despite efforts to save her life, Osiris passed away. Officials are still determining the exact cause of her death. Two other belugas rescued from Marineland—Rain, a 20-year-old female, and Peekachu, a 23-year-old—had also died in recent weeks. Additionally, Beethoven, a 34-year-old male who was part of the aquarium's existing beluga group, died around the same time. In response, Shedd Aquarium has stated that its staff will continue to monitor all whales around the clock, adjusting care, habitats, and routines to meet their evolving needs. Marineland, located in Niagara Falls, Ontario, closed in September 2024 following allegations of animal abuse by staff members, as reported by the Canadian Broadcasting Corporation (CBC). At the time of closure, the park had 30 beluga whales on-site, and their continued care depended on public donations. When donations ran out, the whales faced the possibility of euthanasia. Their caretakers sought help from the Canadian government, and two aquariums—Shedd Aquarium in Chicago and SeaWorld San Antonio—agreed to take in the belugas. In July, the whales were transported in large tanks of water aboard a Boeing 777 to their new homes. Both facilities already had experienced staff and resident belugas, which helped ease the transition for the rescued animals.