Fall Migration Maps (Click a map for the live view.) Please Report Your Sightings! ALL Sightings ROOSTS PEAK Sightings ALL Migration Sightings This map displays all of the sightings people report, from a single migrating butterfly to dozens, hundreds or even thousands of butterflies. By comparing these sightings we try to determine when and where the migration peaks. Overnight Roosts Monarchs rest at overnight roosts at the end of each migration day. This map shows where large gatherings of resting butterflies were seen! Peak Migration Sightings Spectacular sightings--or the season's biggest waves of migration--are shown on this map. It shows when and where peak migration events occur. NO Monarchs Sighted FIRST Monarchs Sighted OTHER Observations No Monarchs Sighted Report here if you have been watching for monarchs but have not seen any. This information is very important! It gives us what's called "absence data." It tells us that we do have observers in places where monarchs have not been reported. (Without this information we wonder, are there no monarchs or simply no observers in such places?) First Monarch Sighted This information tells us where monarchs have either been absent or have gone undetected prior to the date of this first sighting. The signficance depends upon location: In Canada or the northern U.S. it suggests very few monarchs have been breeding in the region. In the south first sightings could be early migrants from the north or locally breeding monarchs that had gone undetected. Other Monarch Observations If you see monarchs that are laying eggs, nectaring, or flying, but you're not sure if they are migrating, report your sightings as "OTHER Monarch observations." Why is fall migration difficult to map? Read on...>>   About the Data and Legend Legend Each color shows one week. Each observation is shown as a dot on the map. The dots are color-coded. A different color is used every week. (Notice dates of legend).   More About Mapping... Mapping Basics >>   Analyzing Journey North Maps >> Variables to Explore >> Weather, Climate and Resource Maps

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