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Bicyclus anynana male and female

Bicyclus anynana male and female

Female Bicyclus anynana butterflies (left) feature larger eyespots on their wings than their male (right) counterparts. New research shows that the hormone ecdysone regulates the eyespot size in B. anynana, both between males and females and between wet- and dry-season morphs. (Photo credit: William H. Piel and Antónia Monteiro)

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