From 1910 to 1970, humans killed an estimated 1.5 million baleen whales in the frigid water encircling Antarctica. They were hunted for their blubber, baleen -- the filtering fringe they have in place of teeth -- and meat. One might assume that from the perspective of krill -- the tiny shrimp-like creatures the whales feast on -- this would be a boon. But new research published Nov. 4 in Nature from a collaboration led by Stanford University's Goldbogen Lab suggests the opposite: that the decline of baleen whales in the Southern Ocean has led to a decline of krill.