Many birds have dwindled because of radiation from the nuclear power plant accident in Chernobyl. Yet a new study in the Journal of Applied Ecology, reported by the AAAS, finds that some species are declining at a far greater rate. The greatest decline is in brightly colored species (orioles, blackbirds, and blue tits) inhabiting high radiation zones. Migrant birds are also faring worse than residents. Both groups possess high levels of antioxidants &mdash a substance needed to protect against radiation sickness &mdash but which the authors suggest may be in short supply in birds maintaining bright plumage and/or birds sustaining their metabolism during long migrations. . . Yet another blow to biodiversity. JULIA WHITTY