While the woefully tragic scene has definitely messed people up, some people argue that the reason given in the documentary series for why the walruses are up on the cliff is inaccurate. Canadian zoologist Dr. Susan Crockford claimed it was actually a polar bear attack that encouraged the walruses to fall. (No polar bear is seen in the docu-series.) However, per TMZ , Netflix insists that the fact that less ice is available for the walruses to rest is what put them in dangerous territory.