American Robin Migration Update: February 16, 1999
Today's Report Includes:
About the Robin Map
What an amazing winter map! We at Journey North are used to hearing about robins wintering in northern places, because every year a few hardy robins do spend the coldest season in the north. But this year is unprecedented in the number of robins that stayed in the northern states and southeastern provinces.
Numbers, Numbers, Numbers
The map shows the distribution of robins this winter, but can't tell the whole story about how MANY robins were seen in each spot. Some of those little triangles represent a LOT of robins. A few record-breaking robin totals on Christmas Bird Counts:
Many people counted robins even after Christmas Bird Counts were over. Al Ports counted a flock of 1,000 in
New Hampshire, and Tom Pirro counted 5500 in one roosting area in Massachusetts. Gerry Rising found perhaps 2,000
near Youngstown, New York. A friend of Carolyn Hall counted approximately 10,000 robins as they exited a grove
of trees in north-central Nebraska, and more than 10,000 were counted in Washington State during an Audubon field
trip to the Columbia Basin. Which brings us to this week's
Challenge Question # 2
Think of at least three different methods people might use to count a huge group of birds like these robin flocks. Which would be the most accurate method? Why do you think scientific papers require a careful description of the method used when the paper is about a bird census?
First Robin of Spring?
Discussion of Challenge Question # 1
What factors contributed to so many robins overwintering this year?
As so many students noted, temperatures this fall and winter were, on the whole, very mild, which probably made a lot of robins risk staying farther north. Bobby Pogoloff's 2-3 graders are very clever sleuths. They considered a LOT of possible causes. First they noticed that a lot of the northern robins stayed near the Great Lakes, and pointed out that "maybe the Great Lakes made it warmer because of all the water and the robins stayed in places close to lakes." They also considered the possibility that "first they waited too long because it was warm and then the days got too short to migrate. Or maybe the summer was wet and more food grew so they had enough for the winter."
Mrs. Cavanaugh's third graders think "the robins were more affected by the warmer temperatures and the
food available to them than the amount of sunlight each day when migration time came." Mrs. Howley's fifth
grades in Maine pointed out that "we don't have snow, only rain and that thaws the ground so robins can get
worms or other food." A few classes mentioned global warming. Some birders told Journey North that in some
western areas apples were left on trees because prices were too low to make it worthwhile picking them to sell,
making even more food available for robins.
How to Respond to Today's Challenge Question
1. Address an e-mail message to: firstname.lastname@example.org
2. In the Subject Line of your message write: Challenge Question # 2
3. In the body of your message, answer the question
The Next Robin Migration Update Will be Posted on March 2, 1999
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