Maybe they are so horny in their reproductive season that selectivity flies out the window?
As the sea ice is periodically shrinking like never before, it pushes the polar bears onto land instead of hunting seals at breathing holes in the sea ice.
They simply had to encounter each other in the range mostly of Grizz.
The Grizz, like the Kodiaks, are land bears and powerful swimmers when they need to be. They don't forage on the ice.
Fact is, it happens. The F1 (offspring, the First Filial generation) was full term, healthy and thrived.
Kodiak. Ursus horribilis. Isn't that a fine name?
Look at one of your big dinner plates.
The palm area of a Kodiak front paw is bigger than that plate.
I watched that BBC video a second time. I've never thought of myself as being claustrophobic.
But, I'm not sharing that hole, even if invited.