Molly

Plymouth Middle School
Robbinsdale School District 281
Plymouth, MN

Abstract

In my experiment I measured the wing size of the males and females we raised in our classroom.  I added the measurements together to get the total length.  Then, I divided by the number of butterflies.  I did this to find out which sex was larger.    After I compared the lengths, the males were larger.  They were larger by a small amount.  I think the data was accurate.  I learned that the males were slightly larger and that the difference between the sexes was small.

Purpose

To find out if there was a difference in wing size due to the sex of the butterfly.

Hypothesis

I think the females' wings are bigger.

Materials

1. butterflies - male and female monarchs
2. paper to record information
3. datasheets for classroom butterflies
4. millimeter rulers
5. log book

Procedure

1. I measured the left and right wings of the monarchs in our class.
2. I determined whether they were male or female.
3. I added the measurements of the right and left wings together to get the total wing length.  I did this for both males and females.
4. I compared the measurements.

Results

I measured 111 butterflies.  I found that the average combined wing length for the males was 97.8 mm and for the females was 96.9 mm. 

Conclusion

I found out that in general the males' wingspan was slightly larger than the females' wingspan.  The females' wingspan is very close to the males'.  I think it is probably very similar in nature since I measured a large number of butterflies.

What I Would Do Differently

Next time I would measure even more butterflies.  I could also ask for data from other schools and compare it to my results.  I could also compare data from year to year and see if it varies.  I would like to do another experiment with monarchs.

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