Antarctic krill may be tiny, but they’re massively important: a whole ecosystem depends on these little crustaceans, with whales, seals, and penguins all relying on them as a primary food source. They’re thought to have the highest collective biomass of any species on earth, but their population is in precipitous decline, pushing scientists to delve into icy waters in search of answers. Their research, dynamically relayed in License To Krill, says as much about the wonder and mystery of nature as it does about the alarmingly immediate effects of climate change.