Archive for October, 2010
This photo shows a female grizzly bear’s vagina during mating season. Her genitals are swollen and more visible than other times of the year. This suggests that male bears may use their sense of sight (in addition to smell) to determine if a female bear is in estrus (ovulating).
Grizzly bear females will ovulate once a year usually in May and June. If her eggs are successfully fertilized, the baby bears will be born in the middle of winter while she is in her den. Her eggs may be fertilized by more than one grizzly male, meaning that grizzly bear siblings may have different fathers. Occasionally you will wonder about this when you spot cubs that are the same age but drastically different sizes.
This grizzly bear male was enamored of our favorite bear Cheetah. Here, he starts approaching her with curiosity.
Cheetah, however, had no interest in him at all and charged at him roaring like an angry lioness.
After a bit of roaring and posturing, Cheetah settled down for a nap in the grass. The smaller male grizzly bear lurked nearby peeking at Cheetah through the grass.
A huge male grizzly bear pauses for a bite of grass while pursuing a female grizzly during mating season. This male was really fun to watch. For about a week we saw him plodding along after female grizzly bears. Here’s a photo of him following a potential mate.:
Click here to read more about this grizzly bear couple.
A grizzly bear female (the mother of the bear in the previous post) spots a splash made by a dashing salmon. You can see the splash in the right bottom corner of the photo. Grizzly bears stand on their hind legs in the water searching for these types of small splashes made by the salmon. This salmon is trying to dash up stream during low tide. Because the water is so low, the salmon’s dorsal fin causes a ripple in the surface of the water. Grizzlies use their keen eye sight to see salmon, as well as listening for the sound of a splash.