Gender-bending butterflies observed in Yale study
by Kristofor Husted
Jan 14, 2011

http://news.medill.northwestern.edu/chicago/news.aspx?id=176272

If you're a male butterfly looking to mate, locate the females raised in cooler temperatures and you can sit back and let them woo you.

Yale University researchers  identified this gender reversal behavior in a strain of the Bicyclus anynana, a butterfly found in Malawi. This is the first species where role reversal has been observed.