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Robin Map Questions

Winter and spring 2012 were warmer than usual across much of the map. By the spring equinox on March 20, strong south winds blowing warm air northward from the Gulf of Mexico had brought a record-breaking heat wave. Meteorologist Andrew Feedman called this heat wave historic. Never since record-keeping began has a weather pattern been so long-lasting, so geographically broad, so early and so extreme. Think about this as you compare the maps showing singing robins in 2011 and 2012:

March 28, 2011 map of First Robin Singing
First Robin Singing 2011

March 27, 2012 map of singing robinsFirst Robin Singing 2012

What do you notice about the location of the aqua-blue dots (sightings for this week) on this year's map compared with last year's map?



Robins sing when they are back on their summer nesting territory. How would you explain why robins are singing farther north earlier in spring 2012 than they were in 2011?