It is considered difficult to study emotions in animals when humans could not communicate with them. One way to identify animal personality traits is to observe the consistency of the individual’s behavior over time and circumstances. For group-living species, there are two opposing hypotheses regarding the assortment of personality within a group: the social niche specialization hypothesis and the conformity hypothesis. To test these two hypotheses, McCune et al. (2018) performed an experiment on the boldness of two species in Corvidae: the Mexican Jay and California Scrub-Jay. Their results confirmed the conformity hypothesis, supported by the significant differences in the group effects. 