Adélie penguins, for example, rely on krill as their main food source. As temperatures rise, sea ice, where krill thrive, is melting earlier and forming later. This shortened hunting season gives Adélie penguins less time to find food, potentially leading to food shortages for them and their chicks.
In addition, penguins need sea ice to find mates and raise their young. Emperor penguins, the largest penguin species, need thick sea ice to build nests and protect their eggs from harsh winds. Unfortunately, with warmer temperatures, the sea ice is melting, becoming thinner and less stable. This instability puts the survival of emperor penguin chicks at risk as their nests can collapse or be washed away.