Making Science Accessible™
5906 Cobalt Road • Bethesda • Maryland • 20816
agm@saltywaters.org • 1(240)461-6171
501(c)(3) • EIN 35-2481383
© 2013 by Ann's Backyard Forest all rights reserved



Making Science Accessible™
5906 Cobalt Road • Bethesda • Maryland • 20816
agm@saltywaters.org • 1(240)461-6171
501(c)(3) • EIN 35-2481383
© 2013 by Ann's Backyard Forest all rights reserved

The remarkable migration has impressed humans inspiring people to monitor population size and health, potential causes for changes in population, and conditions most favorable to monarchs. Observers have reported population decline associated with droughts, habitat loss in both breeding and overwintering grounds, pesticide and land-use changes. The migration itself takes a toll; estimates of death rates suggest 90% of northern born migrating butterflies do not reach the overwintering grounds.