Grizzly Bear and Wildlife Viewing Blog: Yearly Archives: 2014

These two juvenile sibling grizzly bears are waiting for a chance to move out into the river to fish for salmon. Being young they need to time their fishing to avoid the older males and the mothers with cubs. The area Grizzly Bear Lodge use on Knight Inlet for its tours has more than forty bears but there is such an abundance of food little fighting occurs and it is more about a bear timing its approach to the river.  From the size of these bears bellies they seem to be successful and should have no trouble reaching a weight which will carry them through hibernation.

In the spring an important part of a grizzly bear’s diet is high protein sedge grass.  This grass grows in the estuary of the Glendale River that is flooded with salt water at high tide. After the hour or so boat ride from Grizzly Bear Lodge to the river estuary we change boats for a large skiff which allows us to travel up the rive through the acres of sedge grass and obtain some close up photo of the bears grazing. This grizzly is letting us know that we may be with in its comfort zone and it is time to drift down river and give it room. Grizzly bears eat the grass in spring and early summer but once it goes to seed they move on to other food sources like salmon.

The May grizzly cub shown in the April 8th posting shows by comparison the growth that takes place in a little over three months. Even without another grizzly in the photos the size difference is amazing. This growth is because grizzly bear milk contains up to 33 percent fat, more than that in heavy whipping cream. While whole milk just as it came from the cow contains about 3 1/2 percent milk fat. During this time the cubs alternate between nursing, grazing on sedge grass, a variety of berries and obtaining protein from under the rocks turned over on the beach.

The size of these second year cubs can be compared to the April 8th and 10th posting, which show first year cubs. Grizzly bear cubs generally stay with their mother for two years, although they will stay for three or four if the sow does not become pregnant in the fall of their second year. Pregnancy triggers a reaction in the sow through which she drives the cubs off and hibernates on her own in preparation for giving birth to new cubs the following spring. Cubs will often spend their first hibernation together, and three-year olds observed in frequent close proximity in the spring are most likely to be siblings who have denned together. Even second year cubs stay close to their mother especially when they are on a fishing river in the presence of other bears.