Mexico's monarch butterflies are falling victim to a real-life

The decline of Mexico’s monarchs starts in US farmland, where the milkweed caterpillars they eat have vanished.

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Why do monarch butterflies leave Mexico in Spring? Why not stay in

After record low, monarch butterflies return to California – WANE 15

The Monarch Butterfly Migration Turns This Mexican Forest Orange

As Dwindling Monarch Butterflies Make Their Migration, Feds Try to

10 Monarch Migration Facts That Might Surprise You❓

Why is the monarch butterfly known as a tremendous traveler? - Quora

Captive-bred monarch butterflies don't fly south, study says, as

Master Gardener: Why we love the Monarch butterfly