Benjamin Robert Haydon was an English painter who specialised in grand historical pictures, although he also painted a few contemporary subjects and portraits. source
Mama grizzlies mate later than other bears. They have two cubs instead of four. They wait four years - about twice as long as other bears - between having cubs. And after they're pregnant, if winter is hard or their health is not good or the food supply is uncertain, they re-absorb the embryo into their body.