I doubt it. Nothing that swims, flys or walks is more brutal than Homo Sapiens Sapiens. Certainly we carry a grudge longer. Ask the European wolves, oh too late there aren't any, haven't been for centuries.
Depends on your definition of "brutal", I guess.What's that insect? You know, the one that paralyzes it's prey and then deposits eggs inside of it. The eggs hatch and the newborn feed on the alive, but motionless, prey. From the inside out. Yikes!
And male lions will kill a hyena on sight. And not for food.
It seems to me that all creatures can be brutal.