Science and technology

Associated Press
In this June 29, 2012  a rat's nest is seen on the coast of Pajaro Nino Island, Chile. A rat invasion is threatening to tip Humboldt penguins toward extinction. Their eggs have become a favored rat dish, and rats also have been seen eating recently born penguin chicks when their parents were away. The International Union for the Conservation of Nature has had the penguins on its vulnerable list since 1988. (AP Photo/Paulina Arce)

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