the patterns you notice.
happening in the far north?
direction do the colored clusters seem to be moving?
you notice a brand new light blue dot on this map in southern
Texas? How would you explain that?
do you think there are fewer reported sightings in May? (Think
about the time of year in a robin's life cycle. Also thinking
about people like you who send in many of our sightings.)
at the clusters of color.
the latitude at which half the medium blue dots are above and half
are below your string. Do this for the other colors, too.
the latitude change during each data period?
the change steady?
does this tell you about the general (average) progression of
What Do We Learn From Analyzing Robin Maps?
a list of the things you learned as you looked at robin migration
patterns. (What do you know and what can you infer?)
can you find out where the center of the migration is for any
do most robins in North America seem to move in late winter and
spring? What exceptions did you notice?
do you think robins follow the migration patterns they do?
your own questions about robin maps!
See this page of journaling questions: Making
Sense of Journey North Maps
Scientists Have Learned
data like these, scientists have discovered that as temperatures
rise and days grow longer, American robins sense the changes.
individual robins are more sensitive than others, so some
begin singing and showing migratory behaviors when temps
are still below freezing.
robins are less sensitive than others, and wait to migrate
until temperatures are very warm.
comparing robin movements from data like these with day-by-day
weather data, scientists have learned this: Although there
are many confusing exceptions, the majority of robins move
when the average temperature is about 36 degrees F. (See
the activity, Spring