Sunk cost: pigeons (Columba livia), too, show bias to complete a task rather than shift to another

Journal of Comparative Psychology (2012) - Comment
pubmed: 21574688 doi: 10.1037/a0023826 issn: 1939-2087 issn: 0735-7036

Kristina F. Pattison, Thomas R. Zentall, Shigeru Watanabe