People's efforts to plant milkweed and other native habitats are helping the orange-and-black-winged butterflies' survival
that traveled down to Mexico and then joined the Western flight.
The loss of milkweed in monarch habitats is the biggest threat to their numbers. Bruce pins this to an increase in industrial agriculture across the US, which has resulted in monocultures of corn and soy. “The introduction of,” Bruce says. “So we’ve lost millions of milkweed stems from the edges of farm fields because weed herbicides are sprayed.”
Solis notes that weather events can influence the monarch’s journey in several ways. If temperatures are lower in the Midwest in the winter, the insects might have to grapple with a scarcity in milkweed––the sole food source for monarch caterpillars. Tropical milkweed can trick monarchs into staying put during winter, throwing off their entire migration cycle.
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