When sex roles get reversed, some females develop a 'penis'

In many species, the males develop elaborated sexual traits to attract females and dissuade potential rival males through competition. Some iconic examples are the extraordinary feathers of the peacock or paradise birds, ...

New finding shows that males can drive creation of new species

Evolutionary biologists often debate on whether sexual selection can lead to new species. Most studies have focused on natural selection or, for the few studies that considered sexual selection, on how picky females select ...

Why frills put female dinosaurs in the mood for love

Part of dinosaurs' popularity has to be their fascinating, bizarre appearance. There's the Stegosaurus with the famous row of plates down its back, the Triceratops with its giant frilled skull, and the "duck-billed" hadrosaurs ...

First demonstration of sexual selection in dinosaurs identified

Large ornamental structures in dinosaurs, such as horns and head crests are likely to have been used in sexual displays and to assert social dominance, according to a new analysis of Protoceratops carried out by scientists ...

Female birds show their true colours

Showy plumage in birds is not just for the boys, ecologists from Massey University, McMaster University, Canada, Monash University, Australia, and Max Planck Institute for Ornithology, Germany, have demonstrated.

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