I found this clip from a post on the Why Evolution is True blog. Two male giraffes fight by doing what’s called “necking” (it isn’t sweet). Watching it really made me cringe because of the power of the hits… and it’s just so incongruous with the stereotypical image that most people have (including me) of the tall gentle giant.
httpv://www.youtube.com/watch?v=C7HCIGFdBt8
This combat is one of the ideas proposed for how and why giraffes evolved their long necks. The article linked above is quite interesting and explains the idea in more detail.