Memory for individuals: hamsters (Mesocricetus auratus) require contact to develop multicomponent representations (concepts) of others
Journal of Comparative Psychology (2008) - Comment
pubmed: 18489228  doi: 10.1037/0735-7036.122.2.121  issn: 0735-7036  issn: 1939-2087 

Robert E. Johnston, Andy Peng