In the vast, shifting mosaic of the Antarctic pack ice, there exists a creature whose name is a biological misnomer and whose presence is a cornerstone of the Southern Ocean’s ecology. The crabeater seal, despite its moniker, has never been observed eating a crab. Instead, this slender, pale-furred pinniped has evolved to be the world’s most specialized consumer of Antarctic krill. Recent longitudinal studies and satellite telemetry data from the past year have begun to reveal the secret lives of these seals, painting a picture of a species that is far more nomadic and resilient than previously understood, even as its frozen home undergoes rapid transformation. Standing as the most numerous seal species on Earth, the crabeater seal population is estimated to be in the millions, yet they remain elusive to the casual observer due to their preference for the deep, unstable pack ice that surrounds the frozen continent. Unlike the lumbering Weddell seal or the aggressive leopard seal, the...