What
Attracts Monarchs to a Roost?
People often observe monarchs roosting on the same trees — and even the same branches — from one night to the next. Here is how one woman described what she saw:
"Of the hundreds of trees in our yard, the monarchs consistently manage to find the very same tree--AND the same branch--on which the monarchs roosted on nights before. At first I thought it was just chance, but as the incoming butterflies select the same places night after night, I really wonder if the others leave a trail of some sort."
What attracts monarchs to a roost? How could you find out?
- Invent and describe an experiment you could do.
- Then read Dr. Calvert's ideas.
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