The White-Throated Mountain-gem is renowned for its striking sexual dimorphism, with males displaying brilliant white throats and blue crowns, while females are rufous or cinnamon. #MountainGemHumming ...

Knowing which genes are responsible for the transformations could help with developing antifungal treatments, and may have ...

Two extinct hominins, Australopithecus afarensis and Australopithecus africanus, were significantly more dimorphic than chimpanzees and modern humans; Australopithecus afarensis were also ...

A newly published study has found that males of some of our earliest known ancestors were significantly larger than females. The pronounced difference in body size present in both Australopithecus ...

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Men appear to be evolving to be sexier, researchers have found. According to a new paper in the journal Biology Letters, men are getting increasingly "sexy and formidable," gaining in height and ...

Louise Gentle works for Nottingham Trent University. Males are bigger than females, right? Generally, this is true of humans – imagine the extremes of Dwayne “The Rock” Johnson and singer Kylie ...

Eleanor has an undergraduate degree in zoology from the University of Reading and a master’s in wildlife documentary production from the University of Salford. Eleanor has an undergraduate degree in ...

In The Descent of Man, Charles Darwin posits that in most species of mammals, males are larger than females. Although Darwin did not cite evidence to back up this claim, his view on sexual size ...

Ever wonder why males and females of the same species can sometimes look radically different from each other? It's all thanks to a condition known as sexual dimorphism, which is generally triggered by ...

Male and female animals of the same species usually come in different forms or ‘morphs’. The two sexes have distinctive features that include not only visible differences in features such as colour, ...