Nineteenth century commercial whaling killed the vast majority of whales, but some species are coming back, especially humpbacks. Melting Antarctic ice has led to an abundance of krill, and with all that food humpback whales are thriving with high rates of pregnancy. University of California – Santa Cruz Researcher Ari Friedlaender tells Host Steve Curwood the comeback should be celebrated as a conservation victory, but there are questions about how long the krill boom might last. Read the details