dimorphism
How to Look Up a Stegosaurus's Skirt
A Stegosaurus graveyard presents the first concrete evidence of sexual dimorphism in non-avian dinosaurs.
This Half Male, Half Female Cardinal Is the Yin-Yang of Birds (Update!)
Sexual dimorphism -- differences in appearance between males and females -- tends to be very visible in birds. Think of a rooster and a hen, or a peacock and a peahen: Females that spend a lot of time nesting need good camouflage, while males have a...
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