Large seabird colonies have a surrounding boundary known as Ashmole's halo, where food sources are depleted, forcing the birds to travel farther to gather the food they need. The reason seems ...

The annual "catastrophic" molt of the emperor penguin makes the birds especially vulnerable to climate change. Peter Fretwell / British Antarctic Survey Emperor penguins are uniquely adapted to life ...

Schematic illustration showing how repeated dives from shared sea-ice openings lead penguins to encounter krill progressively deeper and farther beneath Antarctic sea ice while feeding rates remain ...