“…Body condition [87][88][89][90][91][92] and weight [87,90,91,[93][94][95][96][97] are common, followed by cortisol (CORT) analysis using a variety of body part such as fecal matter [41,57,69], hair [97], saliva [97], and blood [28,92,[97][98][99], as well as surrounding water for aquatic animals [100] and feathers [74]. Some work involved animal sacrifice at the end of the study, resulting in biopsies [81,83,93,96,99] and meat quality analysis [91,101]. Related to physiological metrics, general metrics are also utilized, such as food and water consumption [60,94], distance traveled [76,84,85,87,94], speed [76], pitch of vocalization [82], and game outcomes [29].…”