Mass die-off "have become more common for birds, marine invertebrates, and fish"http://news.nationalgeographic.com/news/2015/01/150113-mass-die-off-disease-animals-environment-science/ …
Mass Animal Die-Offs Are on the Rise, Killing Billions and Raising Questionshttp://news.nationalgeographic.com/news/2015/01/150113-mass-die-off-disease-animals-environment-science/ …
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"Disease, human-caused disturbances, and biotoxins are three major culprits" of mass animal die-offshttp://news.nationalgeographic.com/news/2015/01/150113-mass-die-off-disease-animals-environment-science/ …
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