Wolves communicate using scent marks, their voices, and their bodies, Their postures and facial displays express joy, dominance, submission, aggression, or fear. In humans this is called non-verbal communication.
Wolves and humans even prefer the same meats. That mutual love for the taste of sheep, cattle, deer, and elk leads to most wolf-human conflicts.
We are both territorial. Wolves howl and scent mark to claim territory. We string barbed wire and draw lines on maps. We both fight to keep or take territory. Wolves killing wolves - often in turf wars - is the most common natural cause of wolf death. In a similar way, humans kill many humans in wars.
We may be so much like wolves because they were our teachers. When out hunting, early humans surely encountered these efficient predators. Some scientists believe that humans honed their hunting skills by watching wolves. It's possible that early humans learned ways to live in families after observing wolf packs.
Wolves and humans have so much in common that we are, in fact, competitive species. Competition drives humans to wage a one-sided war against wolves, using a deadly arsenal including biological and chemical weapons. We have the ability to exterminate all the wolves we find; we have used it - and continue to use it.