50 million years ago, the phorusrhacid, a 2-meter-high carnivore, was at the top of the food chain. The bird was ... only in ...

The waters around Antarctica, which support few species but large populations, are one of the richest biological provinces on earth. The key organism in the simple food chain is the shrimplike krill ...

Scientists track Antarctic krill via satellite to monitor ocean health amid climate change and fishing threats.

Adélie penguins are a vital part of the Antarctic food chain – they eat tiny creatures like krill and small fish, and are a source of food for predators like leopard seals and killer whales. By ...