Preening is also a social activity; birds will preen one another to remove feather sheaths that they cannot reach by themselves. Birds may also attempt to "preen" their humans hair. Preening should not be confused with feather biting or plucking.

Why are my birds preening each other?

A healthier, more attractive bird will attract a stronger mate and have a better chance of raising many strong, healthy chicks. Bonding between mates as a courtship ritual that involves mutual preening, called allopreening. This is a form of communication between mates and helps keep their connection strong.

How do birds show affection to each other?

Love and affection: Gentle courtship behavior such as mutual preening or sharing food shows a bond between mated birds that can easily be seen as love. ... Birds that mate for life may show love toward one another in many ways, including sharing companionship throughout the year just as human mates will.