Click HERE to learn more about the use of tropical milkweed in Arizona 

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Dramatic Decline in Western Butterfly Populations Linked to Fall Warming

https://news.arizona.edu/story/dramatic-decline-western-butterfly-populations-linked-fall-warming 

Western Monarch Population Plummets: Status, Probable Causes, and Recommended Conservation Actions

https://www.frontiersin.org/articles/10.3389/fevo.2019.00258/full?utm_source=Enews+July+2019+%231&utm_campaign=July+Enewsletter+1&utm_medium=email

Citizen science monitoring demonstrates dramatic declines of monarch butterflies in western North America

https://www.sciencedirect.com/science/article/abs/pii/S0006320717304809

A Method to Project Future Impacts From Threats and Conservation on the Probability of Extinction for North American Migratory Monarch (Danaus plexippus) Populations

https://www.frontiersin.org/articles/10.3389/fevo.2019.00384/full