Karen Oberhauser is the founder and director of the Monarch Larva Monitoring Project and former director of the University of Wisconsin-Madison Arboretum. To put 2.2 acres in perspective, she said that’s less than two football fields.
“So that means that all of the monarchs from this huge area in the northern part of the United States — imagine the northeastern quarter of the United States — all of those butterflies are in an area in Mexico right now smaller than two football fields,” Oberhauser told WPR’s “The Morning Show.”