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Why is the eastern monarch butterfly disappearing?

Why is the eastern monarch butterfly disappearing?
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Michigan state universityUnited statesErin zylstraElise zipkinLeslie ries of georgetown universityDepartment of integrative biologyCollege of natural scienceBehavior programNational science foundationNature ecologyIntegrative biologyLeslie riesGeorgetown universityமிச்சிகன் நிலை பல்கலைக்கழகம்ஒன்றுபட்டது மாநிலங்களில்ஏரின் ஜய்ல்ஸ்திறா