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Monarch Butterflies Face Migration Crisis Amid Climate Change

2/25/2026

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Summary

Story summary

Climate change threatens North American monarch butterfly migration as overwintering habitat in Mexico moves south.
Some monarchs could remain in Mexico instead of returning north.
Monarch populations have fallen more than 80% since the 1990s due to habitat loss and other factors.
Studies project overwintering habitat to fall from 19,500 square kilometers to about 8,000 by 2070.
Wing size may indicate whether monarchs migrate or stay.

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Story summary

Climate change threatens North American monarch butterfly migration as overwintering habitat in Mexico moves south.
Some monarchs could remain in Mexico instead of returning north.
Monarch populations have fallen more than 80% since the 1990s due to habitat loss and other factors.
Studies project overwintering habitat to fall from 19,500 square kilometers to about 8,000 by 2070.
Wing size may indicate whether monarchs migrate or stay.