F. de Waal and A. van Roosmalen, “Reconciliation and Consolation Among Chimpanzees,” Behav Ecology and Sociobiology 5 (1979): 55; E. Palagi and G. Cordoni, “Postconflict Third-Party Affiliation in Canis lupus: Do Wolves Share Similarities with the Great Apes?” Animal Behav 78 (2009): 979; A. Cools et al., “Canine Reconciliation and Third-Party-Initiated Postconflict Affiliation: Do Peacemaking Social Mechanisms in Dogs Rival Those of Higher Primates?” Ethology 14 (2008): 53; O. Fraser and T. Bugnyar, “Do Ravens Show Consolation? Responses to Distressed Others,” PLoS ONE 5, no. 5 (2010), doi:10.1371/journal.pone.0010605; A. Seed et al., “Postconflict Third-Party Affiliation in Rooks, Corvus frugilegus,” Curr Biol 2 (2006): 152; J. Plotnik and F. de Waal, “Asian Elephants (Elephas maximus) Reassure Others in Distress,” Peer J 2 (2014), doi:10.7717/ peerj.278; Z. Clay and F. de Waal, “Bonobos Respond to Distress in Others: Consolation Across the Age Spectrum,” PLoS ONE 8 (2013): e55206.