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Gulf oil spill: Animals at risk

Royal terns

Photo: Gary Heinz/U.S. Geological Service

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Royal tern

Royal terns have already begun nesting on the barrier islands, according to the National Audubon Society. Royal and least terns (both shown in this photo) feed on fish and other marine life. Roosting and nesting on the sand and plunging into the water to fish, they are vulnerable to oil on the water's surface and oil that washes ashore.