The Yautja Berserkers were either a subspecies or newly advanced species of the original yautja (predator). They are seen in the movie Predators.
In the movie, there are three "berserkers", the Tracker, the Falconer and the namely Berserker predator which was the main villain of the film.
Unlike the classic yautja, they are disrespectable to the classic rule by killing unarmed prey, and attacking their own by tying on the classic predators to a podium. It appears that the larger ones are aggressive to their younger cousins, which is confirmed when the berserker and the classic fight. To the death which ends with the berserker ripping off the classic's head.