How does the monarch's spring migration compare from one year to the next? These maps show when and where people saw their first monarch each spring. Look at the maps and answer the questions below. (Click maps to enlarge.)
		Combined Years animation/map/data
Spring 2011 animation/map/data	Spring 2010 animation/map/data	Spring 2009 animation/map/data
Spring 2008 animation/map/data	Spring 2007 animation/map/data	Spring 2006 animation/map/data
Spring 2005 animation/map/data	Spring 2004 animation/map/data	Spring 2003 animation/map/data
Spring 2002 animation/map/data	Spring 2001 animation/map/data	Spring 2000 animation/map/data
Spring 1999 map	Spring 1998 map	Spring 1997 map
Additional Monarch & Milkweed Maps The maps on this page only show where people reported their first monarch of spring. For related spring monarch maps from past years ("1st Milkweed," "First Egg," "First Larva" and "Other Observations"), see Maps and Data from Past Seasons

Try This:

• Describe the ways that the migrations similar from one year to the next.
• How are they different? Describe.
• List all the factors you think might cause the migrations to be different from one year to the next.
• List all the factors that might cause the data to be different from year to year. Review the lesson, "You're the Scientist: Verifying Data Collected by Peers." Have a classroom discussion, and make a list of questions generated in your class.
• What do the maps tell you about monarch migration?
• What don't they tell you?

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