How Many Monarchs in a Single Photo?
Arriving in Mexico, November 5, 2005
(Back to start.)

We didn't want to even try to count all of the butterflies! We used part of the photo to make our estimate.

  • First we divided the photo into equal squares by using a grid.
  • Then we counted the number of squares. (How many do you count?)
  • Next, we took a close-up view of one square. We chose the square in the upper left corner. (The red arrow is pointing to the square.)

Take a look. >>