A strong cold front swept across the continent from west to east this week, and people reported monarchs moving in its wake. Progressively, from South Dakota to Quebec, reports followed the passing of the front.
"There's a roost on my mom and dad's farm. Over 1,500 are clustering in multiple trees. When the sun hits the monarchs in the morning they open their wings and flutter around but mostly they seem to be resting." Yankton, SD September 6, 2014
"While driving west, I observed four monarchs in 10 minutes, all heading south across the highway." Chanhassen MN, September 7, 2014
Following Shorelines
Monarchs moved in a
steady stream along the shores of the Great Lakes this week. The peak migration map shows where monarchs were concentrated and thereby reveals migration pathways. We can compare the flow at one site to the other by calculating migration rates:
Migration Rate: 3 per minute
"While conducting a hawk watch we watched as monarch after monarch flew by on migration. They were everywhere! Between 11:00 AM and 5:30 PM my best guess would be in the neighbourhood of 1,000! Oh, happy day!" Scarborough, Ontario September 6, 2014
Migration Rate: 1 per minute
"Counted 108 adults between 11 am and 12:30 pm. All headed from the north to the southwest." Mariatown, Ontario September 9, 2014
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