[FarmerPotato]

Monarchs are threatened during migration. It’s about how many individuals survive the round trip to breed more.

Drought and fire are two natural factors that destroy their migration routes’ food supply. Another is agriculture.

Folks like Monarch Watch and Xerces encourage planting of the few milkwood species (ie weeds) that the butterflies depend on for energy or egg-laying.

Restoring prairie is also effective. But there’s still drought and wildfire.