Neanderthals? Yes with them our cousins there is the possibility of interbreeding having occurred, but most likely is that as a species as a whole they went ext

Neanderthals? Yes with them our cousins there is the possibility of interbreeding having occurred, but most likely is that as a species as a whole they went extinct from competition. If even with our similarities and closeness there was enough competition to drive them extinct, I can hardly imagine any (land) species could have been thriving in coexistence with us.