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Two Polar Bear Cubs Born at the Detroit Zoo

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Two Polar Bear Cubs Born at the Detroit Zoo

Two polar bear cubs were born at the Detroit Zoo on November 17, 2020, to 8-year-old mother Suka, and 16-year-old father, Nuka. The cubs, who have not been named yet, are the first polar bears to be born and successfully raised at the Detroit Zoo since 2004.
Suka gave birth to cubs in 2018 and 2019, but none survived beyond a few days.
The cubs were born in a specially-designed, private maternity den away from the other bears. It is equipped with infrared video cameras that allow staff to monitor the mother and cubs without disturbing them. On November 19, it was observed that one of the cubs was becoming inactive and appeared to be weak. The staff allowed Suka out of the den so that the weak cub could be retrieved.
The cub, a female, was taken to the Detroit Zoo’s Ruth Roby Glancy Animal Health Complex where she was examined by veterinarians and given fluids and formula. She has continued to receive around-the-clock care and bottle feeding.
At two days old, she weighed 556 grams (1.2 pounds). Today, she is 5.12 kilograms (11.3 pounds), and she has graduated from an incubator to a “playpen”. She will eventually go back to live in the Arctic Ring of Life habitat. It is not yet known if she can be reunited with her mother and sibling, but eventually she will live with other bears.
Meanwhile, the Detroit Zoo continue to monitor Suka and the cub she is caring for. She has been a very attentive mom; continuously nursing, grooming and cuddling her cub, with only short water and bathroom breaks.
Both cubs are currently in private, behind-the-scenes areas and are not viewable by guests. However, 16-year-old Nuka, the cubs’ father, and 20-year-old Anana are viewable in the Arctic Ring of Life’s tundra and pack ice habitats. Underwater viewing in the Frederick and Barbara Erb Polar Passage is not open to guests, as part of the Detroit Zoo’s biosafety protocols in response to the COVID-19 pandemic.
At birth, polar bear cubs are remarkably small and vulnerable, only 560 grams (1.2 pounds) compared to their mother’s weight of 377 kilograms (830 pounds).
The rare occurrence of twin polar bears being raised separately – one by the mother and one by humans – means that much will be learned through this experience. Both cubs are monitored closely and their developmental milestones tracked. Their eyes are open, their teeth are coming in, and they are both learning to take their first steps.
The births are part of the Association of Zoos & Aquariums (AZA) Polar Bear Species Survival Plan, a cooperative population management and conservation program that helps ensure the sustainability of healthy captive animal populations. Currently there are 56 polar bears in 25 AZA-accredited zoos and aquariums.
All guests and members visiting the Detroit Zoo, ages two and older, are required to have reservations. In an effort to maintain physical distancing among guests, the DZS is limiting capacity within the Zoo over the 125 acres. Reservations can be booked here up to two weeks in advance.
Unless otherwise prevented by a medical condition, the Detroit Zoological Society requires that all guests 5 and older wear a mask at all times while at the Zoo. Guests may temporarily remove their masks when they are eating and drinking. Read the full mask policy on detroitzoo.org/health. Follow the Detroit Zoo Facebook page for weekly polar bear cub updates.

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