Here They Come!
May 17, 2017 by Elizabeth Howard
  The outburst of 1st Generation butterflies is beginning.

Monarch Butterfly

This female in Wisconsin is one of the week's northern-most monarchs.
Sighting and photo by Chris Smith in Hudson, Wisconsin on May 14, 2017

Moving into Minnesota
After a 3-week lull, the migration advanced to latitude 45°N this week. Observers in Minnesota were ready and waiting to welcome the monarchs.

"One adult flying around the Driskill's grocery store and by the library at high speed, about single story roof height. Unable to pinpoint male or female. It was bright, definitely not a Gen Zero (from Mexico)," wrote Patti Keiper from Hopkins, MN on May 14th.    

Eggs Across the Landscape
Since their arrival in Texas in March, we've watched for two months as the monarchs from Mexico have laid eggs across the landscape. Now, we're beginning to see the explosive growth of the 1st spring generation. Over the summer breeding season, the population will increase with each new generation.

One monarch could produce a billion butterflies in only 4 generations if all of her eggs survived. In this week's slideshow, explore the limiting factors that keep the population from growing exponentially.

Monarch Butterfly
From 43°N to 45°N
Monarch Butterfly
Laying Eggs in MN
T. Nowak

From Eggs to Butterflies
How Does a Population Grow?


Monarch Butterfly Journal Page

Companion Resources


Photo Gallery

Text Only Article

Teaching Suggestions


Driving Question

What limiting factors keep the monarch population from growing exponentially?

Evaluation: Share your thoughts!
Please take a few minutes to complete our Annual Evaluation. With your help, we can document Journey North's reach, impact and value. Thank you!

Journey North Evaluation
Spring Migration 2017
Report all monarchs you see — adults, eggs, larvae.
Monarch butterfly migration map Monarch butterfly migration map Monarch butterfly migration map
What to Report Adults
report | map | list
report | map | list
Monarch butterfly migration map Map of milkweed emergence: Spring 2017 Monarch butterfly migration map
report | map | list
report | map | list
Other Observations
report | map | list

Next May 18, 2017