Wolves love to play, shouldering one another, bumping bodies together, flopping tails over each other's backs, and leaping up placing forepaws around other' necks. Play especially in pups, develops strength and hunting skills, and aids in establishing pack communication and hierarchy. The intention to play is often signaled by the gesture well known to dog owners of dropping the front quarters into a crouch position, with smiling face and wagging tail. Adult wolves stage mock fights, play chase, and leap on each other. The ambushing of unwary pack members is a favorite game.
Wolves mark their territory with urine and faeces.
This is called scent marking. Of course, their sense of smell also tells them when food or enemies are near. That is one of the ways wolves communicate with their voices. Wolves don't howl at the moon. They will howl any time of the day but are most often heard in the evening because that is when the pack is most active.