Disoriented Monarchs: Climate Change Threatens Their Return to the North
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Every autumn, millions of monarch butterflies undertake a journey of up to 4,800 kilometers from the north of the United States and Canada to the oyamel forests in the mountains of central Mexico.This journey, so extraordinary for an insect, requires a surprisingly sophisticated navigation system.But according to a new study published in the magazine PLOS One, that system could be failing due to climate change.Two biological measures: the secret…
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