“…Behavioural correlates of a social mode of life include affiliative behaviour, a wide spectrum of non-aggressive (friendly) social contacts and interactions [1,2]. Theoretical and experimental research devoted to that issue involves the use of numerous synonymous notions such as prosocial behaviour (pro-sociality) [3][4][5][6][7][8][9][10][11][12][13][14], cooperative behaviour (cooperation) [11,[15][16][17][18][19][20], altruistic behaviour (altruism) [11,16,17,[19][20][21][22][23][24], helping behaviour [3][4][5][16][17][18]25,26] and rescue behaviour [18][19][20][26][27][28][29][30]. The exact scopes of these notions are not easy to delineate, as they are not always defined in precisely the same way.…”