Monarch Mapping

The range of monarch (Danaus plexippus) populations changes dramatically between breeding areas, migration routes, and winter roosts. In the Americas, monarchs range from Canada to South America. This list is dedicated to mapping all lifestages (egg, larva, pupa, adult) wherever they occur.

it is estimated that fewer than 10% of monarch eggs and caterpillars survive to adulthood because they are so vulnerable to weather, parasites, and disease. Monarchs are harbingers of environmental change, and it seems that their numbers may be continuing to decline. So, it is important to document trends in populations and migration patterns.