New
Butterfly or Old?
Watching the Wings for Clues
Wing-condition Quiz
Butterfly wings become worn and faded over time. Therefore,
the condition of a butterfly's wings is a clue to its age. Every spring, we ask observers to look carefully at
the condition of a monarch's wings. Wing-condition
suggests various things about the butterfly, depending on when
and where it is seen. Here are some examples:
- By the month of March, monarchs that have over-wintered in Mexico are about
7 months old. We expect their wings to be very worn, tattered and faded.
- All monarchs do not go to Mexico for the winter. For
example, many years some are present in Texas and breed, especially along the Gulf Coast. When these monarchs produce offspring,
the young butterflies have fresh, new wings.
- Breeding butterflies only live for a few weeks. Their wings typically do not have
time to get as old, torn, and faded as those that over-winter in Mexico.
- Most
monarchs that over-winter in Mexico are dead by the end of April.
Fresh new butterflies--children of those that overwintered
in Mexico--continue the journey north.
Wing-condition
Quiz
Using a technique
developed by Dr. Karen Oberhauser and Dr. Bill Calvert, you can
estimate how old and worn a monarch is. The three monarchs below were captured in
Texas in the spring
in the Aschen family's backyard. They
show monarchs at various stages of wing-wear.
- Read
the descriptions of wing conditions below. Which description
do you think matches monarchs #1, #2, and #3?
-
Click to enlarge the image for a closer look.
Wing
Condition
= 0 |
Wing
Condition = 2 |
Wing
Condition
= 4 |
New,
recently emerged. |
No
holes, no tattering, but beginning to have missing scales to cause
fade. |
Very
faded, some tattering and holes. Orange beginning to turn gray, black
just beginning to turn charcoal, but not yet transparent or "ghostly".
|
Journaling
Questions
- Which
butterfly do you think could be from Mexico?
- Which
might be a young butterfly from Texas?
- If you
saw a torn and tattered monarch in Oklahoma on April 1st, where would
you think it came from?
- What happens
to a monarch to make its wings fade and are damaged over time? What
things might touch their wings? How might the sun and weather affect
them? Write a short story and describe the misadventures in the day-to-day
life of a butterfly.
|