Photo by @bertiegregory for my new @natgeowild series on Youtube, 'Wild_Life with Bertie Gregory.' A female black bear and her two cubs on edge as a male bear approaches. Surprisingly, the biggest threat to young cubs is other black bears, specifically big male black bears. This is because male bears want to kill cubs that are not their own so that the female will come back into heat. The male can then mate with this female to father his own cubs. If you're after a cuteness overload, check out this week's episode for a bear cub bonanza! www.natgeowild.com/wildlife @explorecanada #explorecanada