What are the advantages of animals living together?

There will be less competition for breeding. The males of social animals often have intense battles for the pack's females. However, two males of a solitary species may still meet each other during the breeding season in search of a female and fight. It's just that these fights will be less likely and less intense. Also, if a solitary animal catches prey, it doesn't have a social obligation to share the food; it can eat the whole thing.