Spring is here and the bears at Wildlife Safari have started venturing out and stretching their legs after a long four months of hibernation. Although still a little sleepy, the bears are looking happy and healthy, having lost a substantial amount of weight during their time of rest.
When the bears first get up, they ease into eating again, starting on small amounts of simple foods and slowly increasing as summer approaches.
The black bears typically hibernate for longer than the brown bears, but are also starting to emerge for the spring.
In the wild, spring is the time when cubs are around, emerging from their dens with their mothers for the first time. Bears will give birth while hibernating, with cubs nursing on their snoozing mother through the winter. By the time spring rolls around, cubs are big enough to explore and play while their mothers find food.
This may seem like a good way to raise small young, and it is not just good timing that allows them to give birth during hibernation. Bears can actually delay implantation of fertilized eggs to make sure their pregnancy goes through these resting months. “Delayed implantation is a really cool feature of the bear reproductive cycle,” says Melissa Fox, primary bear trainer at Wildlife Safari. “Bears will typically mate in late spring, but the fertilized egg won’t attach to the uterine wall until fall, and only if the female has gained enough weight to sustain her – typically around 150lbs.” If the female does not gain that weight, the pregnancy will be terminated. This pregnancy will only last 2 months, giving the little cubs time to grow before the end of the hibernation period. Cubs are born tiny and hairless, though they are much bigger and stronger when they leave the den. “They are born early so they can switch to mammary nourishment (milk) sooner,” explains Fox. “It’s more energy efficient.”
As their primary, Fox spends a lot of time with both the brown and black bears. “I love how intelligent and playful they are,” she says. “It makes them so much fun to work with.”
Once they are awake and ready to eat, bears are mostly foragers – eating whatever is around. While they do eat meat, they won’t generally hunt, preferring to eat prey that another animal has caught, although they will also fish.
Big Bear encounters have started, so if you haven’t met our brown bears, now is the perfect time to come and see them!