It's interesting that they use the term
war for a tribal conflict between groups of chimpanzees, involving only a dozen or so casualties.
The important thing to note is that humans and chimpanzees share 96-
98% of DNA depending on the study. And tribal conflict is the most pervasive - and flawed - human behaviour. The 40,000+ year history of Aboriginal Australia is often cited as an example, as conflicts between tribes were a theme throughout.
In modern society, we see both subtle and acute tribal battles between nation-states, all based on imaginary man-made borders overlayed onto a single contiguous planet. Then there's ethnic groups, political factions, bikie gangs, business entities and football teams. You'll find endless other examples with little effort. Apple vs. Samsung? (In my day, it was Sega vs. Nintendo!)
Special honours go to religion, which involved some of the most primitive and brutal battles of all, yet purported to be in the name of some cosmic force. Sad that this is what happens when humans try to connect to something more profound than the same old tribalism. We don't know how to stop the primal divide-and-fight instinct even as it is threatening all of our survival.
Being cognisant of this very primitive aspect of our human nature helps us to avoid becoming a part of it ourselves.