Humans are social species, and on a surface level we act like other social animals. We are both cooperative and selfish.
But human social is so complex it’s rly hard to reduce it. We have by far the most complex social structures etc.
as far as we understand. some species like dolphins and octopuses are far more complex than we are, but many of us refuse to accept that due to human exceptionalism and the religiously rooted idea of anthropocentrism.