Data source: Brower, L.P. et al., Decline of monarch butterflies overintering in Mexico: is the migratory phenomenon at risk? Insect Conservation and Diversity (2012), 5, 95-100. Last updated 2019/03/29.
Data source: Brower, L.P. et al., Decline of monarch butterflies overintering in Mexico: is the migratory phenomenon at risk? Insect Conservation and Diversity (2012), 5, 95-100. Last updated 2019/03/29.