Originally Posted by Xaccers

Sorry, I added the dolphin bit while you were typing.
Dolphins will gang up and bully a porpoise, whacking it so hard it's thrown out of the water.
Eventually they kill the porpoise through physical attacks and exhaustion.
They don't eat the porpoise.

Chimpanzees will attack monkeys, beat them against trees or drop them from high branches, rip them limb from limb, but then not eat them.
Some have even started attacking and killing human babies in settlements near their habitat.