Most king penguins living in the Southern Ocean will need to relocate by the end of the century if nothing is done to tackle climate change, BBC News reports. The birds raise their chicks on ice-free sub-Antarctic islands that are close to foraging grounds rich in sea life. But new models show that at the current rates of greenhouse gas emissions, warming seas will push these foraging grounds much farther south. By 2100 they will be beyond the reach of 70% of king penguins, meaning these birds will need to rapidly colonize new islands or their population will decline. Writing in Nature Climate Change, the researchers say that with immediate action to reduce greenhouse gas emissions, most existing king penguin colonies could still survive.