Interesting to see after reading about it in your YWP post.
I've seen it in horses, particularly young ungelded horses or stallions kneeling and using necks to try and trip the other up (guess it's a similar instinct here) but it's quite something to see it in a giraffe! Good job they were doing that outside.
Giraffa camelopardalis reticulata. Young adult males. These two seemed well-matched, but I think it was just sparring rather than a serious fight.
Giraffes do not show much emotion, and there were many intervals when they paced slowly and silently around each other before another bout of action. Each episode started when one swung his head against the other's flank, with a loud impact: the other sometimes responded in the same way, but more often swung his head under the other's belly and tried to lift the nearside rear leg high off the ground - this looked far more dangerous as it seemed to risk causing a fall (right hand image). But no harm seemed to happen.
