It’s true in much of the higher species of the animal kingdom. The females hang together with the young and males go solo until it’s mating season. Some animals travel as mixed groups with a male leader, the remaining males being still under their mother’s care. In a few cases where the group is matriarchal, for example, elephants, the fully grown males go solo until mating season. In creatures that mate for life, it is couples that flock together with other couples. 

Humans are not animals. We are not materialist atheists. They say we are animals. We alone have intellect and Free Will, created in the image and likeness of God. No other "animal" shares that distinction. We are not (mere) animals.