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Robin Map Questions
2009

Robin Heard Singing
April 14, 2009

2011

Robin Heard Singing
April 12, 2011

Comparing Spring Reports of Robins Singing

Each spring observers report when they hear their first robin singing on territory. A singing robin is a fairly clear sign that the robin has staked its nesting territory for the season. We can use maps to compare robins reported singing from year to year.

Carefully study the maps above.

  • What are the two maps comparing?
  • How are the the two maps different?
  • What do you notice about the number of dark blue dots (sightings after April 5)?
  • List 3 ideas that could explain differences between the two maps.