TABLE 2.

Species in which pain assays producing a grimace scale have been used.

Species	References
Human	Ashraf et al. (2009), Lucey et al. (2011), Bartlett et al. (2014)
Rodent (rats and mice)	Langford et al. (2010), Sotocinal et al. (2011), Matsumiya et al. (2012), Leach et al. (2012), Oliver et al. (2014), Faller et al. (2015), Miller et al. (2016), De Rantere et al. (2016), Akintola et al. (2017), Philips et al. (2017), Schneider et al. (2017), Sperry et al. (2018), Dalla Costa et al. (2018), Cho et al. (2019), Klune et al. (2019), Leung et al. (2019), Ernst et al. (2020)
Pigs/Piglets	Di Giminiani et al. (2016), Viscardi et al. (2017)
Cat	Evangelista et al. (2019), Evangelista et al. (2020)
Sheep	Häger et al. (2017)
Rabbit	Banchi et al. (2020)
Ferrets	Reijgwart et al. (2017)
Horse	Dalla Costa et al. (2014), Dalla Costa et al. (2018)

For review see (Tappe-Theodor and Kuner, 2014; Deuis et al., 2017; Mogil, 2019b; Tappe-Theodor et al., 2019; Turner et al., 2019).