Social behavior of small mammals living under natural conditions often is inferred from live-trapping data, particularly from incidents in which two or more individuals are captured together in a trap.
Even today, social behavior is relatively rare among mammals. But these findings suggest the need for company in some mammalian species is an ancient evolutionary invention.

Loneliness in small mammals occurs when naturally social species are housed in isolation without conspecific companions.The veterinarian or behaviorist will ask about activity levels, appetite, sleep patterns, vocalizations, stereotypic behaviors, and responses to handling.

Summary. Keywords. marine mammals, sociality, behavior, social learning, culture, individual behavioral variation, personality, conservation. Citation. Brakes P and Dall SRX (2016) Marine Mammal Behavior: A Review of Conservation Implications.

Mammal social behavior goes back to the Age of Dinosaurs. ."This study suggests that social nesting behavior arose during the Mesozoic and likely has multiple origins among mammals," says Judy Skog, a program director in NSF's Division of Earth Sciences.
thermoregulation. types of social behavior (3): asocial. simple/seasonal aggregations. complex year-round aggregations. type of social behavior in which groups only come together to breed. typically alone. territorial and aggressive to other members of species during nonbreeding season.
A new study led by paleontologists at the University of Washington and its Burke Museum of Natural History & Culture indicates that the earliest evidence of mammal social behavior goes back to the Age of Dinosaurs.