They also are the only apex predator that refuses to eat us. Orca overall will eat anything, but each individual orca pod has their own unique diet. This means that if a polar bear is found by the “wrong orcas,” (from the polar bear’s perspective) the polar bear gets eaten. Yup that’s right. The largest and deadliest land predator is prey for orcas. That being said, if an injured seal is near the “right orcas,” since seal isn’t on their menu, they’ll either totally ignore the seal, or maybe bump it towards the shore. Humans are off their menus, and we don’t know why. The last recorded Orca attack in the wild happened in the late 1800s and if the records are to be believed, the human in question was doing everything they could to piss off that orca. The orca in question bit the human, tasted what it had bitten, and immediately let go. The human got a gnarly scar, but kept his arm. (This doesn’t apply to Orcas in captivity that we gave massive psychological trauma to.)
My theory is that around 200,000 to 250,000 years ago, just as we were getting started as a species, an orca decided to kill a sick, injured, and or young human, and the response that we gave them terrified the orcas that saw it so much that they told all the other orca that you don’t eat the hairless apes. They will kill everyone that tries.