Agence France-Presse: Waddling over the rocks, legions of penguins hurl themselves into the icy waters of Antarctica, foraging to feed their young.
Like seals and whales, they eat krill, an inch-long shrimp-like crustacean which forms the basis of the Southern Ocean food chain.
But penguin-watchers say the krill are getting scarcer here around the western Antarctic peninsula, under threat from climate change and fishing.
"Krill is the power lunch of the Antarctic. It's a keystone species for everybody," says...