monarch butterfly

Plant Threatens Michigan Monarchs

Apr 20, 2017
Saginaw Bay CISMA

Since 2012 a poisonous plant has affected how monarch butterflies in Michigan develop. Swallow-wort was not seen as a problem when it was first brought to the United States during the 19th century. But now the decorative plant in gardens is a threat to monarchs.

Sehvilla Mann / WMUK

More than one species of butterfly has seen its numbers drop – in some cases plummet – in recent years. The monarch is doing better than some.

Brocken Inaglory, Wikicommons

Western Michigan University Biological Sciences Professor Stephen Malcolm says the population of the monarch butterfly in North America has dropped over the last 20 years. 

Ekabhishek, Wikimedia Commons

Western Michigan University Professor of Biological Sciences Stephen Malcolm is among the scientists warning that monarchs are becoming rare east of the Rocky Mountains in North America.