How Many Monarchs?
This is how a monarch butterfly colony looks from the air. The trees look orange because they are covered with monarch butterflies! Scientists have just finished measuring all of the monarch colonies in Mexico. How do you suppose they count so many butterflies? You'll find out in this week's update. But first, how many monarchs do you think are in this picture? What steps would you take to estimate? Try it!

Photo: Dr. Lincoln Brower, Sweet Briar College