Facial bones evolving over time
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Male faces 'evolved' due to fist fights

9 June 2014 Last updated at 12:01 BST

Male humans developed stronger facial features to protect against fist fights, according to scientists.

Researches at the University of Utah found that the facial bones of early ape-like bipeds, australopiths, were strongest in areas most likely to receive a blow from a fist.

Professor David Carrier, the evolutionary biologist who led the study, argued that the traits evolved as the need for males to fight increased.

He told BBC Radio 5 live's Breakfast: "There was a lot of fighting going on... Males competing for females but also males probably defending territory."