The species has barely existed for the blink of an eye in evolutionary terms so there's not much past in that regard. On our own timescale terms we have a rare

The species has barely existed for the blink of an eye in evolutionary terms so there's not much past in that regard. On our own timescale terms we have a rare tendency to group together for intra species battles, and a unique tendency to do that with groups numbering millions. We have an evolutionarily unprecedented and unmatched phenomenon, advanced intelligence, which we employ in scaling the destruction in those battles, to the point we now have the ability to cause catastrophic, possibly existential damage to our species, at least as a civilisation wherein this discussion makes sense; let alone the collateral damage to our environment and co-habitees. That's just the war stuff. The peaceful things we do are too depressing to mention.