Neva, Hogle Zoo's female polar bear, has disappeared into her den for the season, tipping the scales at 822 pounds before she settled in for weeks of quiet isolation. Her partner Nikita, meanwhile, is still very much in view, greeting guests and working through enrichment activities over in Rocky Shores.
The zoo announced Neva's move into denning season this week, according to Gephardt Daily, which reported both her weight and the start of the seasonal shift. It's an annual ritual for the pair: Hogle Zoo says Nikita and Neva share habitat space each spring for breeding before parting ways in the fall, a pattern that plays out every year regardless of what comes next.
During their time together, the two bears rest near each other, growl softly, share toys, and exchange open-mouth greetings — sometimes leaving each other with minor wounds in the process, according to zoo information cited by Gephardt Daily. That courtship period happens every spring and summer, but once it ends, biology takes over in a much more private way.
Why Nobody Can Say If Cubs Are on the Way
Female polar bears experience something called delayed implantation, where a fertilized egg only attaches and begins developing in the fall if the mother has built up enough fat reserves, per the same Hogle Zoo account. That's part of why keepers push Neva's diet upward starting in spring — the zoo's team begins increasing her food intake specifically to help her reach an ideal denning weight, since females can gain up to a third of their body weight before heading into the den.
Even with Neva's weight gain documented this year, the zoo is careful not to get ahead of the science. There's no reliable way to know whether a female is actually pregnant or simply experiencing a pseudopregnancy at this stage, the zoo notes, and females may den even when no cubs are on the way at all. Hogle Zoo says it is prioritizing both bears' wellbeing and remains cautiously optimistic while staying prepared to support them in whatever situation plays out.
A Den Built Like an Arctic Snowbank
The space Neva retreated into wasn't thrown together last minute. Hogle Zoo's animal care team transformed her den into a calm, dark, soundproofed sanctuary with specialized cooling controls designed to mimic a frozen Arctic snowbank, complete with reinforced HVAC and soft substrate meant to minimize disruption. If cubs do arrive, Hogle Zoo says Neva and her little ones would remain in that den until late spring.
Polar bear cubs under human care are typically born between early November and late December, according to Columbus Zoo, a window that roughly lines up with wild denning behavior. In the wild, female polar bears typically start denning in October or November, give birth in December or January, and exit their dens in March or April, Gephardt Daily reported in earlier coverage of Neva's denning cycle. One federal wildlife agency has also tracked how long mothers stay put once inside: the U.S. Geological Survey found that females observed with cubs emerged later and remained in dens roughly two weeks longer than females that came out without cubs.
A Familiar Playbook at Other Zoos
Hogle Zoo isn't the only facility navigating this uncertain stretch of the calendar. At the Columbus Zoo and Aquarium, female polar bear Aurora began the same annual denning behavior. The zoo fully separated her from her male counterpart, Lee, in late September. That zoo said it would not know for sure whether Aurora was pregnant until November or December, striking a similarly cautious tone to Hogle's.
Columbus Zoo keepers gave Aurora a quiet, secluded area away from both Lee and the facility's brown bears, and limited vehicle and pedestrian traffic through the service area to keep her den as undisturbed as possible. If Aurora does have cubs, the zoo expects her to emerge with them at around 12 weeks of age. Lee and Aurora were originally reintroduced in February 2023 as part of a broader breeding effort under the Association of Zoos and Aquariums' Species Survival Plan, giving that pairing a longer runway than the uncertainty surrounding Neva's current cycle.
For now, Salt Lake City visitors won't see Neva at all, but Nikita remains a draw at Rocky Shores while his den mate rests out of view. When Neva is tucked away, Nikita continues training sessions and enrichment activities in his own habitat, giving guests a reason to stop by even during the quietest stretch of the polar bears' year.
