Journal of Comparative Psychology (2014) - Comment
pubmed: 24491175  doi: 10.1037/a0034840  issn: 1939-2087  issn: 0735-7036 

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Julie J. Neiworth, Katherine M. Whillock, Seo Hyun Kim, Julia R. Greenberg, Katherine B. Jones, Anushka R. Patel, David L. Steefel-Moore, Allyson J. Shaw, Deborah D. Rupert, Jacqueline L. Gauer, Aisha G. Kudura