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?
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Does
a scent — or something else monarchs can sense —
attract monarchs to the same branch each night?
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(Science
standards >>)
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