We came across a journey of giraffe during a mid-afternoon photo drive on Zimanga Game Reserve. Several of the males had gathered together away from the rest and were busily beating on each other using head, neck and horns. It only seemed to be play fighting, rather than any real push to establish dominance as they seemed to far too young for that.
From Wikipedia:
“Adult giraffes do not have strong social bonds, though they do gather in loose aggregations if they happen to be moving in the same general direction. Males establish social hierarchies through “necking”, which are combat bouts where the neck is used as a weapon. Dominant males gain mating access to females, which bear the sole responsibility for raising the young.”