A taxonomic theory is put forth that there are a cluster of behaviors that are generally characteristic of mammals, the same as there is a cluster of physical traits that are generally characteristic of mammals. These behaviors are play, kissing, dreaming, killing prey before devouring, hygiene, interspecies bonding, vocalization, interspecies helping, culture, behavioral mimicry, tickling, need
... [Show full abstract] for tactile behavior from conspecifics, inequity aversive, creating art, plasticity of behavior, personality, intelligence and reaction to the death of a conspecific. Whereas some of the behaviors are well documented, others have been sporadically detected through opportunistic observation and require extensive research to either confirm or deny their inclusion. One of the principal aims of this paper is to spur research on behaviors that up to now have been overlooked.