Liza Moscovice et al. (2019); Elisabetta Palagi et al. (2020).
451
Zanna Clay and Frans de Waal (2015).
452
Dick Swaab and Michel Hofman (1990); Dick Swaab (2010).
453
E. O. Wilson (1978), p. 167.
454
Simon LeVay (1991); Janet Halley (1994); Elizabeth Wilson (2000).
455
William Byne et al. (2001).
456
Ivanka Savic and Per Lindström (2008); Andy Coghlan (2008).
457
Ivanka Savic et al. (2005); Wen Zhou et al. (2014).
458
Bruce Bagemihl (1999); Charles Roselli et al. (2004).
459
Niklas Långström et al. (2010); Andrea Ganna et al. (2019).
460