ROYAL OAK, Mich. – A female polar bear at the Detroit Zoo was killed during a mating attempt on Monday.
Staff at the zoo said they’re in shock. A 20-year-old bear named Anana was killed by 16-year-old Nuka.
READ: Polar bear killed at Detroit Zoo
“I wish we understood what happened yesterday with the polar bears,” Detroit Zoo Chief Life Sciences Officer Scott Carter said. “We don’t understand exactly what happened that caused the conflict that resulted in her death. We are trying to learn as much as we can. The male that she was with has been with other females. He’s the father of the little cubs that we have now. He’s never shown behavior like this towards a female before.”
Carter said both polar bears lived together during the breeding season from March through October of last year.
“When bears and other large carnivores breed, it is sometimes described in nature as an aggressive encounter. It usually involves physical control of the female by the male, which usually includes him holding her by the back of her neck,” Carter said.
Carter said they separated the bears for some time because polar bears like to be on their own. They recently reunited the bears for this year’s breeding season.
“They lived together fine up until yesterday,” Carter said.
The zoo said tissue samples from Anana have been sent to several labs.
The male bear is now living alone.
The Detroit Zoo released a statement late Monday:
A female polar bear at the Detroit Zoo was killed by the Zoo’s adult male bear on Monday, February 8, 2021. 20-year-old Anana died when 16-year-old male Nuka was attempting to breed her. According to Detroit Zoological Society Chief Life Sciences Officer Scott Carter, the two bears had lived together without incident in 2020. “This was completely unexpected and the Detroit Zoo staff is devastated by the loss of Anana in this sudden and tragic event,” Carter said. The Detroit Zoo has not experienced the killing of one animal by another animal in decades; the last occurrence was also with polar bears in 1988.
After being apart for several months, Nuka and Anana were re-introduced last week as 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. This program is vital to sustaining this endangered species and can result in successes like the recent birth of twin cubs, fathered by Nuka at the Detroit Zoo. Currently there are only about 55 polar bears in 25 AZA-accredited zoos and aquariums.
Nuka has lived at the Detroit Zoo since 2011 and has lived with, and bred with, several other female bears without showing harmful behavior. Anana came to the Detroit Zoo in January, 2020, and was introduced to Nuka at the end of March. The Detroit Zoo’s other adult female polar bear, Suka, is in a private maternity den with one of her cubs.
Detroit Zoological Society