Did Giraffes Necks Evolve to Help Regulate Heat?

There are multiple theories as to why and how giraffes evolved to have such long necks. One new theory from scientists explores a surprising possibility: The giraffes' necks evolved to help them regulate heat. The paper, which was published in the Journal of Arid Environments, describes calculations that led the researchers to their hypothesis. They subdivided the surface of giraffes into four components - the head, neck, trunk and upper legs, and lower legs to try and calculate the surface area of the animal. Their findings weren't conclusive, so the true reason how giraffes necks evolved remains a mystery.

http://gizmodo.com/giraffes-could-have-evolved-their-long-necks-for-a-su...

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