barvins commented on dienasgramata's post:

Par vēsturi nezinu, bet
Vismaz ziloņi rūpējas par slimajiem. http://www.savetheelephants.com/images_user/publications/pdf/2006%20Douglas-Hamilton%20et%20al%20Behavioural%20reactions%20of%20elephants%20to%20a%20dying%20matriarch.pdf

Vismaz bonobo kopojas ar seju pret seju. http://www.primates.com/bonobos/bonobosexsoc.html