orca brains have something that humans and land mammals don’t, a highly developed set of brain lobes called the paralimbic system. Scientists aren’t sure what it does, but they speculate that it replaces the function of some other under-developed lobes in their brains that, in land mammals, are linked to spatial memory and navigation, as well as the brain-tying functions of the corpus callosum, or it may enable some brain function we can’t even envision because we lack it.
