Migrating monarchs facing increased parasite risks: Migrating monarch butterflies that mix with year-round residents have higher rates of parasite infection

Migrating monarchs facing increased parasite risks: Migrating monarch butterflies that mix with year-round residents have higher rates of parasite infection

During their annual migration to wintering sites in Mexico, monarch butterflies encounter dangers ranging from cars and trucks to storms, droughts and predators. A study has found evidence that these iconic insects might be facing a new challenge.

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