Adelie penguins frolicking amongst the sea ice. The Adelie and Emperor penguin rookeries on Ross Island were negatively impacted by the icebergs. The icebergs made it too hard for the penguins, with their two inch legs, to go back and forth from the sea (where they get their food) to the rookery (where they feed their hungry chicks). In some cases it was simply too far (e.g. Cape Royds), and in other cases (Cape Crozier) the icebergs mounded up sea ice in giant walls that the penguins had a hard time crossing. In the summer of 2001-2 the Adelie penguins at Cape Royds and the Emperors at Cape Crozier had a complete failure of the rookery - no chicks lived through the summer.