Abstract: Behavioral syndromes occur when an individual maintains similar behaviors throughout a variety of contexts; these characteristic behaviors can be considered analogous to a "personality" and are inherent to an individual. Correlated behaviors cannot be easily explained, as it is often assumed that behavioral plasticity in changing environments is advantageous. One way to study behavioral syndromes is to examine the relationship between an individual's environment and behavior, specifically using endocrine systems as a mechanism of behavioral control. One hormone known to affect both courtship and aggressive behaviors is testosterone (T); in this study, we suggest that behaviors in these two situations may be correlated. To test this relationship, we exposed 17 male dark-eyed juncos ( Junco hyemalis carolinensis ) to both a male conspecific to measure overall aggression, as well as to a female conspecific to measure overall courtship behavior. From the behavioral observations, we determined an individual's overall aggressive and courtship response and analyzed the relationship between these responses. We found only a weakly positive correlation between aggression and behavior; however, a strong positive relationship between the aggressive and courtship song rate was seen. Future data analysis will include hormone assay results of individual blood samples (pre and post GnRH injections) to determine the concentration of T. Additional data will need to be collected in order to accurately determine the relationship between courtship and aggression in individuals.