An international team of scientific detectives has solved the mystery of what has killed 100 eagles and thousands of other birds across the US since 1994. Hydrilla, a popular fish tank plant that has become one of the country's most pernicious aquatic weeds, hosts a previously unknown cyanobacteria. Combined with bromide, found in sedatives and fuel additives and used to sanitize water, the bacteria creates the "eagle killer." While the discovery may lead to control mechanisms, ecologists call it a "red flag" for environmental health.

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