Emperor penguins are in trouble. The roughly four-foot-tall birds are now listed as “endangered” on the International Union for Conservation of Nature’s (IUCN) Red List of Threatened Species, as human-caused global warming melts their Antarctic habitat.

Climate change is pushing two iconic Antarctic species toward the brink of extinction — the emperor penguin and the Antarctic fur seal, a new assessment finds.

Due to melting ice, mass drownings of emperor penguin chicks have occurred at multiple breeding sites, and entire colonies have fallen into the ocean