In the Old Norse written corpus, berserkr (berserkers) were those who were said to have fought in a trance-like fury, a characteristic which later gave rise to the modern English word berserk (meaning "furiously violent or out of control"). Wearing bearskin. Berserkers are attested to in numerous Old Norse sources.
The bear-warrior symbolism survives to this day in the form of the bearskin caps worn by the guards of the Danish monarchs. In battle, the berserkers were subject to fits of frenzy. They would howl like wild beasts, foam at the mouth, and gnaw the iron rim of their shields
They were not cute & cuddly.