*David Attenborough voice*
"These young males tend to hunt in packs, due to their immaturity. Their small statures and quicckness would make them ideal for sneaking up on prey, if only they weren't so brightly colored.
Their bright colors serve to attract potential mates, but also attract the scorn of older males. The older males want the young ones to stop bothering them, as the older ones are in the midst of a fierce competition to decide which group is the alfa. These types of competitions can become very heated, but the young ones, it seems, just want to play.