“…Studies of nonhuman animals have shown that personality traits are ubiquitous in the animal kingdom; a wide range of fish (Mittelbach, Ballew, & Kjelvik, 2014;Toms, Echevarria, & Jouandot, 2010), birds (e.g., chickens, Gallus gallus domesticus, Favati, Leimar, & Lovlie, 2014; zebra finches, Taeniopygia guttata, David, Auclair, & Cezilly, 2011, Schuett, Dall, & Royle, 2011Japanese quail, Coturnix japonica, Miller, Garner, & Mench, 2006), numerous mammal species (e.g., pigs, Sus domesticus, Marino & Colvin, 2015;horses, Equus caballus, Hausberger, Bruderer, Le Scolan, & Pierre, 2004;dogs, Canis familiaris, Svartberg, Tapper, Temrin, Radesäter, & Thorman, 2005;cats, Felis catus, Bennett, Rutter, Woodhead, & Howell, 2017;nonhuman primates, Freeman & Gosling, 2010); reptiles and amphibians (Allard, Fuller,Torgerson-White, & Murray, 2015;Burghardt, 2013), and invertebrates (Kralj-Fišer & Schuett, 2014, for a review) show persistent individual differences that can be organized along core personality dimensions, many of which overlap with those found in humans (Gosling, 2008;Gosling & John, 1999). Vonk, Weiss, and Kuczaj (2017) offer a comprehensive and upto-date review of personality in nonhuman animals.…”