Journal of Insect Conservation

, Volume 13, Issue 3, pp 279–286 | Cite as

The fall migration flyways of monarch butterflies in eastern North America revealed by citizen scientists

  • Elizabeth Howard
  • Andrew K. Davis
Original Paper


The migration of monarch butterflies (Danaus plexippus) from Canada and the United States to overwintering sites in Mexico is one of the world’s most amazing biological phenomena, although recent threats make it imperative that the resources needed by migrating monarchs be conserved. The most important first step in preserving migration resources—determining the migration flyways—is also the most challenging because of the large-scale nature of the migration. Prior attempts to determine the flyways using mark-recapture techniques with wing tags gave some clues, but this important information has never been fully obtainable until now. In 2005 the citizen-science program, Journey North, initiated a project that asked participants to record sightings of overnight roosts of monarchs during their fall migration, and this project now provides an ideal way to illustrate the flyways used by monarchs on their way to Mexico, with the assumption that roost locations indicate migration routes. We used 3 years of this data to elucidate the flyways on a continent-wide scale, that revealed two distinct flyways, but only one appears to lead directly to Mexico. This main, ‘central’ flyway begins in the American Midwest states and southern Ontario, then continues south-southwest through the states of Kansas, Missouri, Oklahoma and Arkansas, and finally passes through Texas and northern Mexico. These data also highlighted a separate, smaller flyway along the eastern and coastal states, but there was a noticeable lack of roost sightings in this flyway at lower latitudes. Since there are few recoveries of marked monarchs in Mexico originating from coastal areas, we compared the timing of roost formation in this ‘eastern’ flyway with the main, central flyway. Roosts in the eastern flyway lagged behind the central roosts in timing, suggesting that monarchs traveling in this flyway have a reduced chance of making it to the Mexico wintering site. Combined, our evidence indicates that locations in the central flyway should be considered priority areas for conserving migration resources.


Monarch butterfly Danaus plexippus Migration Roosts Citizen science 



We thank the thousands of volunteers who participate in the Journey North program, without whose help, this study would have never been possible. We thank Mike Quinn, Chip Taylor and Don Davis for sharing data collected through the Texas Monarch Watch and Monarch Watch networks, and Cindy Schmid for tirelessly managing the Journey North databases. Lincoln Brower served as scientific advisor to the Journey North program. Support for Journey North is provided by the Annenberg Foundation. We also thank Sean Sterrett for helpful comments on an early stage of the manuscript. AKD was supported by funds from the D.B. Warnell School of Forestry and Natural Resources.


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Journey NorthNorwichUSA
  2. 2.D.B. Warnell School of Forestry and Natural ResourcesThe University of GeorgiaAthensUSA

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