Rare Case of Polar Bear Adoption Documented in Canada

Researchers in Canada have documented a rare instance of a female polar bear adopting a cub that was not her own, marking only the 13th case of such behavior in a study population of over 4,600 bears observed for nearly five decades. This event took place during the annual polar bear migration along the Western Hudson Bay near Churchill, Manitoba, a region renowned for its polar bear population. The mother bear, identified as X33991, was first captured in the spring with one cub, which was tagged for research purposes. However, upon subsequent observation, she was seen with a second cub that lacked a tag, indicating an adoption.

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Evan Richardson, a scientist with Environment and Climate Change Canada, noted that female polar bears are instinctively inclined to care for orphaned cubs. "When there's a lone cub out on the tundra, bawling and crying, they just take them under their wing," he explained. The two cubs, estimated to be 10 to 11 months old, are expected to remain with their mother for approximately 2.5 years, during which they will learn essential survival skills, including hunting seals. This maternal care significantly increases the adopted cub's chances of survival, as polar bear cubs face a challenging existence in the wild, with only about 50% surviving to adulthood.

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Researchers plan to analyze genetic samples from the adopted cub to ascertain the identity of its biological mother, who remains unidentified. In previous adoption cases, instances of "switching of litters" have been documented, where the biological mother was still alive. Alysa McCall from Polar Bears International expressed mixed feelings upon confirming the adoption, stating, "It gives you a lot of hope when you realize that maybe polar bears are looking out for each other."

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The International Union for Conservation of Nature lists polar bears as a vulnerable species, primarily due to the loss of sea ice attributed to climate change. This adoption case underscores the adaptability and social behaviors of polar bears, which may be crucial for their survival as environmental conditions continue to change. Richardson emphasized the importance of maternal figures in the wild, stating, "If females have the opportunity to pick up another cub and care for it and successfully wean it, it's a good thing for bears in Churchill."

The Guardian

• “When we confirmed this was an adoption, I had a lot of mixed feelings. But it’s just another reason why this species is so incredible and why they’re so fascinating and interesting. It gives you a lot of hope when you realize that maybe, polar bears are looking out for each other.” — Alysa McCall, Polar Bears International

The Guardian

• “These female polar bears are such good moms, they're maternally primed to take care of offspring, and when there's a lone cub out on the tundra, bawling and crying, they just take them under their wing,” — Evan Richardson, Environment and Climate Change Canada

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• “It's really a feel-good story to know that this female bear is looking after this cub and that it has a chance at survival,” — Evan Richardson, Environment and Climate Change Canada

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This rare event not only highlights the complex social behaviors of polar bears but also serves as a reminder of the challenges they face in a rapidly changing environment.

The Guardian