When winter comes to Antarctica, seals and Adélie penguins leave the freezing shores and head for the edge of the forming sea ice. But emperor penguins stay put.
The existence of emperor penguins seems all but impossible. Their lives revolve around seasons, timing and access to “fast ice” – sea ice connected to the Antarctic coast. Here, the sea ice persists long enough into summer for the penguins to rear their chicks successfully.
But climate change is upending the penguins’ carefully tuned biological cycles. The crucial sea ice they depend on is melting too early, plunging the chicks from some colonies into the sea before they are fully fledged.
