One of the lesser known facts about Old Norse history is that Scandinavian warriors were often accompanied by surprising counterparts from the animal kingdom, seagulls. The latter went into a berserker-like rage, and neither sword, nor spear could stop these avian beasts from dismembering their enemies and feasting upon their skulls.
I totally made this up.
This is just a typical feeding frenzy!
Also, don't feed these berserkers processed white bread--it's not good for them.