“…Strategic comparisons of social behavioral divergence at the species and population levels have discovered causal genetic and neurobiological mechanisms contributing to specific social behaviors (Bendesky et al, 2017; Goodson et al, 2009; Greenwood et al, 2016; Haesler et al, 2007; Haesler et al, 2004; Insel & Shapiro, 1992; Insel et al, 1994; Kowalko et al, 2013; Lim et al, 2004). For example, investigations in alternative species systems spanning teleost fishes and mammals have begun to reveal the roles of brain-region specific OT and AVP receptor (OTR and V1aR, respectively) populations in modulating species-specific social behaviors (DeAngelis et al, 2017; Donaldson & Young, 2008; Goodson & Bass, 2000; Keebaugh et al, 2015; O’Connell et al, 2012; Oldfield & Hofmann, 2011; Song et al, 2014). Comparative investigations followed by causal manipulations and have demonstrated the role of region-specific OTR and V1aR populations in modulating flocking behavior in Estrildidae finches and pair bonding behavior in Microtine voles (Goodson et al, 2009; Insel & Shapiro, 1992; Insel et al, 1994; Lim et al, 2004; Young et al, 2001).…”