sexual dimorphism
Image of the Day: Size Matters
Image of the Day: Size Matters
The Scientist Staff | Feb 23, 2018
The male proboscis monkey’s large nose probably evolved in response to female preference and competition between males.
Image of the Day: Rainbow Butt
Image of the Day: Rainbow Butt
The Scientist Staff | Jan 4, 2018
Scientists explore why male peacock spiders are so colorful. 
Image of the Day: Butterfly Wing Scents
Image of the Day: Butterfly Wing Scents
The Scientist Staff | Nov 13, 2017
In Heliconius butterflies, researchers discover the importance of a male wing structure in female choice. 
RNA-based Sex Determination?
RNA-based Sex Determination?
Bob Grant | Aug 20, 2014
Researchers find that microRNAs may play a role some of the sexual differences seen in fruit flies.
Faces for Fighting?
Faces for Fighting?
Jef Akst | Jun 10, 2014
Scientists propose that hominin facial bones evolved for protection against the powerful blows of combat.
Males Court Bearded Ladies Less
Males Court Bearded Ladies Less
Yao-Hua Law | Nov 6, 2013
Blue badges that make female lizards less attractive to potential mates are paradoxically common.
The Ultimate Wingman
The Ultimate Wingman
Tracy Vence | Nov 1, 2013
Differential gene expression between dominant and subordinate male turkeys could help evolutionary biologists deconstruct the roots of sexual dimorphism.