A Letter for President Enrique Pena Nieto, President Barack Obama, and Prime Minister Stephen Harper

February 14, 2014By

Decline of the Monarch Butterfly Migration in Eastern North America

Among the countless organisms that have evolved during the history of life on earth, monarch butterflies are among the most extraordinary. Sadly, their unique multigenerational migration across our large continent, their spectacular overwintering aggregations on the volcanic mountains in central Mexico, and their educational value to children in Canada, the United States, and Mexico are all threatened. Monitoring of the butterfly population over the past two decades indicates a grim situation.

Following a long-term decline, the total area occupied by the overwintering butterflies plunged from the 20-year average of 6.7 hectares to a record low of 0.67 hectares in the current season, a 90% decrease. This winter, only seven of twelve traditional sites had any butterflies at all, and only one of those (El Rosario, 0.5 hectares) was substantial in size.

A Letter for President Enrique Pena Nieto, President Barack Obama, and Prime Minister Stephen Harper

UPDATED: 02/14/14 – 06:10 PM – This document has been changed numerous times today. Please come back through-out the weekend to make sure you have the final, and correct posting. Thank-you.

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