Scientists estimate that polar bears diverged from brown bears between 250,000 and 130,000 years ago—a recent split when it comes to evolutionary history. Lasting genetic similarities make the two bears biological sister species, more closely related to one another than to any others.
How did polar bears became a separate classification from the grizzly natural selection?
The polar bear has evolved over time from the common brown bear by changing its fur colour to white, the ideal colour to blend in with its ice-covered surroundings. With new data an international research team now documents that the separation from the brown bear into an independent species has gone very quickly.
How are polar bears different from grizzly bears?
Polar bears are marine mammals; grizzlies are terrestrial. But as the Arctic warms, sea ice is shrinking and the tundra is expanding. And the bears’ disparate populations are meeting, mating and creating a new breed that’s capable of reproducing.
Did polar bears evolve from grizzly bears?
Evolutionary studies suggest that polar bears evolved from brown bears during the ice ages. The oldest polar bear fossil, a jaw bone found in Svalbard, is dated at about 110,000 to 130,000 years old.
Why did the brown bear evolved into the polar bear?
The bears were hungry but their paws weren’t good for walking on snow and ice, their fur wasn’t thick enough for the cold conditions and the seals could easily see them coming with their brown fur. … They are now called polar bears.
Can a bear breed with a dog?
While they may look similar, there’s not a direct relationship between bears and dogs. The two can’t breed to create a new hybrid animal, which debunks a common myth about their relationship. In fact, the two animals don’t even share the same number of chromosomes.
Do polar bears eat fish?
Food Preferences & Resources
When other food is unavailable, polar bears will eat just about any animal they can get, including reindeer, small rodents, seabirds, waterfowl, fish, eggs, vegetation (including kelp), berries, and human garbage.
What is the average lifespan of a polar bear?
LIFE CYCLE: Polar bears can live up to 25 or 30 years in the wild.