Sun, Jul 05, 2009
 A penguin, rescued off Rio de Janeiro by the Brazilian coast guard, is treated by a veterinarian at the Niteroi Zoo in Rio. According to officials, more than 400 penguins have been found dead on the state's shores over the past two months, swept northward from Antarctic waters. Experts are divided as to the cause. Ricardo Moraes / the associated press
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What's happening
• Hundreds of baby penguins are washing up dead on Rio de Janeiro's tropical beaches in Brazil.
• More than 400 penguins have been swept from the icy shores of Antarctica and Patagonia, officials said Friday.
• Although it is common to find some penguins swept by strong ocean currents from the Strait of Magellan, there have been more this year than at any time in recent memory.
• Rescuers and those who treat penguins are divided over the possible causes.
• Theory one: Overfishing has forced the penguins to swim farther from shore to find fish, leaving them more vulnerable to getting caught up in the strong currents.
• Theory two: Niteroi, the state's biggest zoo, already has already received about 100 penguins for treatment this year, and many are drenched in petroleum. The Campos oil field that supplies most of Brazil's oil lies offshore.
• Theory three: Global warming, which affects ocean currents and creates more cyclones, makes the seas rougher for the weaker-swimming penguins.
The Associated Press
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