Pigs are highly social animals that form lifelong bonds with preferred companions and often sleep nose-to-nose with their closest friends.

Domestic pigs (Sus scrofa domesticus) are recognized by ethologists as among the most socially complex animals on Earth. Studies from institutions like the University of Cambridge have demonstrated that pigs possess cognitive abilities comparable to dogs and three-year-old humans. They live in matriarchal societies where social hierarchy and individual recognition are essential for survival.Research published in Applied Animal Behaviour Science shows that pigs use diverse vocalizations and physical cues to maintain social bonds. When given a choice, pigs consistently prefer familiar individuals over strangers. This preference results in the formation of stable friendships that can last for years, with bonded pigs often huddling together during rest to regulate body temperature and reduce stress.Neurological studies using electroencephalograms (EEGs) have confirmed that pigs experience significant Rapid Eye Movement (REM) sleep. During these cycles, their brain wave patterns match those observed in humans during dreaming, suggesting they process social interactions and environmental memories while sleeping.The nose-to-nose sleeping position reflects both trust and scent-based recognition. Since pigs have a highly developed sense of smell, this close contact reinforces their social identity within the group. These complex emotional capacities explain why isolation causes severe psychological distress in pig populations.