Ocellated antbird (IMAGE)
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Over a 44-year study, University of Illinois researchers observed significant declines in common tropical bird species, including the Ocellated antbird (pictured), in a protected area in Panama's Parque Nacional Soberanía. The researchers can't definitively point to causes for the decline, but call it a concerning trend.
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John Whitelaw
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Credit John Whitelaw
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