Between species? (Some) kids may have occasionally blown up toads, if movies from the 80s are to be believed. But hurting any mammal or bird without a good reas

Between species? (Some) kids may have occasionally blown up toads, if movies from the 80s are to be believed. But hurting any mammal or bird without a good reason earns you a trip to the psychologist (and police station if old enough). With animals, there obviously is a lot aggression. But I don't think "bullying" is necessarily the right term. It seems more like either predator/pray behaviour or fights to establish social hierarchy. The latter obviously comes close to one definition of bullying. But bullying as you explain it, i. e. "because I can", seems rare. Which is also what evolution would suggest, since getting into useless fights is bound be net-negative: even if chances of winning are overwhelming, there is always some risk. Plus it's a waste of energy. As a test I would suggest looking at solitary, herbivore animals with few natural competitors. Here's a capybara: https://qph.fs.quoracdn.net/main-qimg-b1822fb258d0d6a4ce01db16521cbdac https://qph.fs.quoracdn.net/main-qimg-b1822fb258d0d6a4ce01db...