Butterfly Wing Fluids
Is it true that a butterfly needs to push through the
cocoon to release fluids into the wings so it can fly? There's an
Internet story that if the butterfly doesn't struggle through a
small opening of the cocoon the wings won't develop.
I can find no reliable reference to this. Standard descriptions simply
say the chrysalis splits open, and the butterfly crawls out, and then
begins to pump bodily fluid into the wings to spread them.
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Update: June 2012