[chargingmarmot]

I think you're oversimplifying animal behavior. Some thoughts:

There's a famous study involving capuchin monkeys that shows they have a sense of fairness.

I think many animal species are more sensitive to the suffering of other animals than you're giving them credit for: think of the way mother cats or bears act when they hear their offspring crying. Or the way mother dogs discipline their puppies about nursing.

Think of how donkeys are used commercially to guard sheep and the social instincts of the donkey (again it's linked to maternal behavior).

I think many birds are intelligent enough to want to pursue and punish potential threats.

We don't generally apply the concept of nature vs. nurture to animal behaviors but we really should.