Antarctic penguins switch diet from fish to krill as sea ice vanishes, study finds
Using 30 years of satellite data plus color analysis of penguin guano, researchers show Adélie penguin diets track sea-ice conditions: more fish when ice is plentiful, more krill when ice is scarce. Penguins that rely more on krill are in decline, highlighting climate-driven shifts in the Antarctic food web and increasing competition for krill amid fisheries.