These two giraffes were actually necking on top of a hill in Murchison Falls National Park, Uganda, with the early morning light rising behind them, making for some good silhouette shots. Did you notice the attempted kiss? Necking among young adult males is a form of wrestling, and a test of strength - each trying to wrestle the other off balance to mark dominance, which plays in a group's hierarchy. It is of varying strength and intensity and makes for an exceptionally beautiful choreography.