The places monarchs stop during migration are called stopover sites, and the area of research is called stopover ecology. Dr. Andy Davis studies the stopover ecology of monarchs:
"Like most migratory species, monarch butterflies must stop frequently during their long southward migration to rest and refuel, and the places where they stop are important for the success of the migration."
"While there is a wealth of research into stopover ecology of migrating birds, there are comparatively few studies examining the nature of stopover behavior in monarchs."
Lauren Brice Annapolis, Maryland August 2013